Tuesday, May 17, 2016

Android

Android is a mobile operating system (OS) currently developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. Android's user interface is mainly based on direct manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input. In addition to touchscreen devices, Google has further developed Android TV for televisions, Android Auto for cars, and Android Wear for wrist watches, each with a specialized user interface. Variants of Android are also used on notebooks, game consoles, digital cameras, and other electronics.

Android has the largest installed base of all operating systems of any kind. Android has been the best selling OS on tablets since 2013, and on smartphones it is dominant by any metric.[14][15]

Initially developed by Android, Inc., which Google bought in 2005, Android was unveiled in 2007, along with the founding of the Open Handset Alliance – a consortium of hardware, software, and telecommunication companies devoted to advancing open standards for mobile devices. As of July 2013, the Google Play store has had over one million Android applications ("apps") published, and over 50 billion applications downloaded.[18] An April–May 2013 survey of mobile application developers found that 71% of developers create applications for Android,[19] and a 2015 survey found that 40% of full-time professional developers see Android as their priority target platform, which is comparable to Apple's iOS on 37% with both platforms far above others.[20] At Google I/O 2014, the company revealed that there were over one billion active monthly Android users, up from 538 million in June 2013.[21]

Android's source code is released by Google under open source licenses, although most Android devices ultimately ship with a combination of open source and proprietary software, including proprietary software required for accessing Google services.[3] Android is popular with technology companies that require a ready-made, low-cost and customizable operating system for high-tech devices.[22] Its open nature has encouraged a large community of developers and enthusiasts to use the open-source code as a foundation for community-driven projects, which add new features for advanced users[23] or bring Android to devices originally shipped with other operating systems. At the same time, as Android has no centralised update system most Android devices fail to receive security updates: research in 2015 concluded that almost 90% of Android phones in use had known but unpatched security vulnerabilities due to lack of updates and support.[24][25] The success of Android has made it a target for patent litigation as part of the so-called "smartphone wars" between technology companies

Sunday, May 8, 2016

Barack Obama Biography


Barack Obama is the 44th and current president of the United States, and the first African American to serve as U.S. president. First elected to the presidency in 2008, he won a second term in 2012.
Synopsis

Born on August 4, 1961, in Honolulu, Hawaii, Barack Obama is the 44th and current president of the United States. He was a community organizer, civil-rights lawyer and teacher before pursuing a political career. He was elected to the Illinois State Senate in 1996 and to the U.S. Senate in 2004. He was elected to the U.S. presidency in 2008, and won re-election in 2012 against Republican challenger Mitt Romney.

Early Life

Barack Hussein Obama II was born on August 4, 1961, in Honolulu, Hawaii. His mother, Ann Dunham, was born on an Army base in Wichita, Kansas, during World War II. After the Japanese attack on Pearl Harbor, Dunham's father, Stanley, enlisted in the military and marched across Europe in General George Patton's army. Dunham's mother, Madelyn, went to work on a bomber assembly line. After the war, the couple studied on the G.I. Bill, bought a house through the Federal Housing Program and, after several moves, ended up in Hawaii.
Obama's father, Barack Obama Sr., was born of Luo ethnicity in Nyanza Province, Kenya. Obama Sr. grew up herding goats in Africa and, eventually earned a scholarship that allowed him to leave Kenya and pursue his dreams of going to college in Hawaii. While studying at the University of Hawaii at Manoa, Obama Sr. met fellow student Ann Dunham, and they married on February 2, 1961. Barack was born six months later.

As a child, Obama did not have a relationship with his father. When his son was still an infant, Obama Sr. relocated to Massachusetts to attend Harvard University and pursue a Ph.D. Obama's parents officially separated several months later and ultimately divorced in March 1964, when their son was two. Soon after, Obama Sr. returned to Kenya.

In 1965, Dunham married Lolo Soetoro, a University of Hawaii student from Indonesia. A year later, the family moved to Jakarta, Indonesia, where Obama's half-sister, Maya Soetoro Ng, was born in 1970. Several incidents in Indonesia left Dunham afraid for her son's safety and education so, at the age of 10, Obama was sent back to Hawaii to live with his maternal grandparents. His mother and half-sister later joined them.
Education

While living with his grandparents, Obama enrolled in the esteemed Punahou Academy, He excelled in basketball and graduated with academic honors in 1979. As one of only three black students at the school, Obama became conscious of racism and what it meant to be African-American. He later described how he struggled to reconcile social perceptions of his multiracial heritage with his own sense of self: "I noticed that there was nobody like me in the Sears, Roebuck Christmas catalog. . .and that Santa was a white man," he wrote. "I went into the bathroom and stood in front of the mirror with all my senses and limbs seemingly intact, looking as I had always looked, and wondered if something was wrong with me."

Obama also struggled with the absence of his father, who he saw only once more after his parents divorced, when Obama Sr. visited Hawaii for a short time in 1971. "[My father] had left paradise, and nothing that my mother or grandparents told me could obviate that single, unassailable fact," he later reflected. "They couldn't describe what it might have been like had he stayed."

Ten years later, in 1981, tragedy struck Obama Sr. when he lost both of his legs in a serious car accident. Confined to a wheelchair, he also lost his job. In 1982, Obama Sr. was involved in yet another car accident while traveling in Nairobi. This time, however, the crash was fatal. Obama Sr. died on November 24, 1982, when Obama was 21 years old. "At the time of his death, my father remained a myth to me," Obama later wrote, "both more and less than a man."

After high school, Obama studied at Occidental College in Los Angeles for two years. He then transferred to Columbia University in New York City, graduating in 1983 with a degree in political science. After working in the business sector for two years, Obama moved to Chicago in 1985. There, he worked on the impoverished South Side as a community organizer for low-income residents in the Roseland and the Altgeld Gardens communities.

Law Career

It was during this time that Obama, who said he "was not raised in a religious household," joined the Trinity United Church of Christ. He also visited relatives in Kenya, and paid an emotional visit to the graves of his biological father and paternal grandfather. "For a long time I sat between the two graves and wept," Obama wrote. "I saw that my life in America—the black life, the white life, the sense of abandonment I'd felt as a boy, the frustration and hope I'd witnessed in Chicago—all of it was connected with this small plot of earth an ocean away."

Returning from Kenya with a sense of renewal, Obama entered Harvard Law School in 1988. The next year, he joined the Chicago law firm of Sidley Austin as a summer associate and Michelle Robinson, a young lawyer assigned to be Obama's adviser.  Not long after, the couple began dating. In February 1990, Obama was elected the first African-American editor of the Harvard Law Review. He graduated magna cum laude from Harvard in 1991.

After law school, Obama returned to Chicago to practice as a civil rights lawyer with the firm of Miner, Barnhill & Galland. He also taught constitutional law part-time at the University of Chicago Law School between 1992 and 2004—first as a lecturer and then as a professor—and helped organize voter registration drives during Bill Clinton's 1992 presidential campaign. On October 3, 1992, he and Michelle were married. They moved to Kenwood, on Chicago's South Side, and welcomed two daughters several years later: Malia (born 1998) and Sasha (born 2001).

Entry Into Illinois Politics

Obama published an autobiography, Dreams from My Father: A Story of Race and Inheritance, in 1995. The work received high praise from literary figures such as Toni Morrison and has since been printed in more than 25 languages, including Chinese, Swedish and Hebrew. The book had a second printing in 2004 and was adapted for a children's version. The audiobook version of Dreams, narrated by Obama, received a Grammy Award for best spoken word album in 2006.

Obama's advocacy work led him to run for a seat in the Illinois State Senate. He ran as a Democrat and won election in 1996. During his years as a state senator, Obama worked with both Democrats and Republicans to draft legislation on ethics, as well as expand health care services and early childhood education programs for the poor. He also created a state earned-income tax credit for the working poor. As chairman of the Illinois Senate's Health and Human Services Committee Obama worked with law enforcement officials to require the videotaping of interrogations and confessions in all capital cases after a number of death-row inmates were found to be innocent.

In 2000, Obama made an unsuccessful Democratic primary run for the U.S. House of Representatives seat held by four-term incumbent candidate Bobby Rush. Undeterred, he created a campaign committee in 2002 and began raising funds to run for a seat in the U.S. Senate in 2004. With the help of political consultant David Axelrod, Obama began assessing his prospects for a Senate win.

Following the 9/11 attacks in 2001, Obama was an early opponent of President George W. Bush's push to go to war with Iraq. Obama was still a state senator when he spoke against a resolution authorizing the use of force against Iraq during a rally at Chicago's Federal Plaza in October 2002. "I am not opposed to all wars. I'm opposed to dumb wars," he said. "What I am opposed to is the cynical attempt by Richard Perle and Paul Wolfowitz and other armchair, weekend warriors in this administration to shove their own ideological agendas down our throats, irrespective of the costs in lives lost and in hardships borne." Despite his protests, the Iraq War began in 2003.
U.S. Senate Career

Encouraged by poll numbers, Obama decided to run for the U.S. Senate open seat vacated by Republican Peter Fitzgerald. In the 2004 Democratic primary, he defeated multimillionaire businessman Blair Hull and Illinois Comptroller Daniel Hynes with 52 percent of the vote. That summer, he was invited to deliver the keynote speech in support of John Kerry at the 2004 Democratic National Convention in Boston. Obama emphasized the importance of unity and made veiled jabs at the Bush administration and the diversionary use of wedge issues.

After the convention, Obama returned to his U.S. Senate bid in Illinois. His opponent in the general election was supposed to be Republican primary winner Jack Ryan, a wealthy former investment banker. However, Ryan withdrew from the race in June 2004 following public disclosure of unsubstantiated sexual deviancy allegations by his ex-wife, actress Jeri Ryan.

In August 2004, diplomat and former presidential candidate Alan Keyes accepted the Republican nomination to replace Ryan. In three televised debates, Obama and Keyes expressed opposing views on stem cell research, abortion, gun control, school vouchers and tax cuts. In the November 2004 general election, Obama received 70 percent of the vote to Keyes' 27 percent, the largest electoral victory in Illinois history. With his win, Obama became only the third African-American elected to the U.S. Senate since Reconstruction.

Sworn into office on January 3, 2005, Obama partnered with Republican Senator Richard Lugar of Indiana on a bill that expanded efforts to destroy weapons of mass destruction in Eastern Europe and Russia. Then, with Republican Senator Tom Coburn of Oklahoma, he created a website to track all federal spending. Obama also spoke out for victims of Hurricane Katrina, pushed for alternative energy development and championed improved veterans' benefits.

His second book, The Audacity of Hope: Thoughts on Reclaiming the American Dream, was published in October 2006. The work discussed Obama's visions for the future of America, many of which became talking points for his eventual presidential campaign. Shortly after its release, the book hit No. 1 on both the New York Times and Amazon.com best-seller lists.

2008 Presidential Election

In February 2007, Obama made headlines when he announced his candidacy for the 2008 Democratic presidential nomination. He was locked in a tight battle with former first lady and then-U.S. senator from New York Hillary Rodham Clinton. On June 3, 2008, Obama became the Democratic Party's presumptive nominee after winning a sufficient number of pledged delegates during the primaries, and Clinton delivered her full support to Obama for the duration of his campaign. On November 4, 2008, Barack Obama defeated Republican presidential nominee John McCain, 52.9 percent to 45.7 percent, to win election as the 44th president of the United States—and the first African-American to hold this office. His running mate, Delaware Senator Joe Biden, became vice president. Obama's inauguration took place on January 20, 2009.

When Obama took office, he inherited a global economic recession, two ongoing foreign wars and the lowest-ever international favorability rating for the United States. He campaigned on an ambitious agenda of financial reform, alternative energy and reinventing education and health care—all while bringing down the national debt. Because these issues were intertwined with the economic well-being of the nation, he believed all would have to be undertaken simultaneously. During his inauguration speech, Obama summarized the situation by saying, "Today I say to you that the challenges we face are real. They are serious and they are many. They will not be met easily or in a short span of time. But know this, America: They will be met."

First 100 Days

Between Inauguration Day and April 29, 2009, the Obama administration took action on many fronts. Obama coaxed Congress to expand health care insurance for children and provide legal protection for women seeking equal pay. A $787 billion stimulus bill was passed to promote short-term economic growth. Housing and credit markets were put on life support, with a market-based plan to buy U.S. banks' toxic assets. Loans were made to the auto industry, and new regulations were proposed for Wall Street. Obama also cut taxes for working families, small businesses and first-time home buyers. The president also loosened the ban on embryonic stem cell research and moved ahead with a $3.5 trillion budget plan.

Over his first 100 days in office, President Obama also undertook a complete overhaul of America's foreign policy. He reached out to improve relations with Europe, China and Russia and to open dialogue with Iran, Venezuela and Cuba. He lobbied allies to support a global economic stimulus package. He committed an additional 21,000 troops to Afghanistan and set an August 2010 date for withdrawal of nearly all U.S. troops from Iraq. In more dramatic incidents, he ordered an attack on pirates off the coast of Somalia and prepared the nation for a swine flu outbreak. He signed an executive order banning excessive interrogation techniques and ordered the closing of the military detention facility at Cuba’s Guantanamo Bay within a year (a deadline that ultimately would not be met). For his efforts, the Nobel Committee in Norway awarded Obama the 2009 Nobel Peace Prize.
2010 State of the Union

On January 27, 2010, President Obama delivered his first State of the Union speech. During his oration, Obama addressed the challenges of the economy, proposed a fee for larger banks, announced a possible freeze on government spending in the following fiscal year and spoke against the Supreme Court's reversal of a law capping campaign finance spending. He also challenged politicians to stop thinking of re-election and start making positive changes. He criticized Republicans for their refusal to support any legislation and chastised Democrats for not pushing hard enough to get legislation passed. He also insisted that, despite obstacles, he was determined to help American citizens through the nation's current domestic difficulties. "We don't quit. I don't quit," he said. "Let's seize this moment to start anew, to carry the dream forward, and to strengthen our union once more."

Challenges and Successes

In the second part of his first term as president, Obama faced a number of obstacles and scored some victories as well. In spite of opposition from Congressional Republicans and the populist Tea Party movement, Obama signed his health care reform plan, known as the Affordable Care Act, into law in March 2010. The new law prohibited the denial of coverage based on pre-existing conditions, allowed citizens under 26 years old to be insured under parental plans, provided for free health screenings for certain citizens and expanded insurance coverage and access to medical care to millions of Americans. Opponents of the Affordable Care Act, which foes dubbed "Obamacare," asserted that it added new costs to the country's overblown budget, violated the Constitution with its requirement for individuals to obtain insurance and amounted to a “government takeover” of health care

On the economic front, Obama worked to steer the country through difficult financial times. After drawn-out negotiations with Republicans who gained control of the U.S. House of Representatives in the 2010 mid-term elections, he signed the Budget Control Act of 2011 in an effort to rein in government spending and prevent the government from defaulting on its financial obligations. The act also called for the creation of a bipartisan committee to seek solutions to the country's fiscal issues, but the group failed to reach any agreement on how to solve these problems.

Also in 2011, Obama signed a repeal of the military policy known as "Don't Ask, Don't Tell," which prevented openly gay troops from serving in the U.S. Armed Forces. In March 2011, he approved U.S. participation in NATO airstrikes to support rebels fighting against the forces of Libyan dictator Muammar al-Qaddafi, and in May he also gave the green light to a covert operation in Pakistan that led to the killing of infamous al-Qaeda leader Osama bin Laden by a team of U.S. Navy SEALs.

Obama gained a legal victory in June 2012 when the U.S. Supreme Court upheld the Affordable Care Act’s individual mandate, which required citizens to purchase health insurance or pay a tax. In a 5-4 decision, the court decided the health care law’s signature provision fell within the taxation power granted to Congress under the Constitution. Voting with the majority were two associate justices appointed by Obama—Sonia Sotomayor (confirmed in 2009) and Elena Kagan (confirmed in 2010).

2012 Re-Election

As he did in 2008, during his campaign for a second presidential term, Obama focused on grassroots initiatives. Celebrities such as Anna Wintour and Sarah Jessica Parker aided the president's campaign by hosting fund-raising events.

"I guarantee you, we will move this country forward," Obama stated in June 2012, at a campaign event in Maryland. "We will finish what we started. And we'll remind the world just why it is that the United States of America is the greatest nation on Earth."

In the 2012 election, Obama faced Republican opponent Mitt Romney and Romney's vice-presidential running mate, U.S. Representative Paul Ryan. On November 6, 2012, Obama won a second four-year term as president by receiving nearly five million more votes than Romney and capturing more than 60 percent of the Electoral College.

Nearly one month after President Obama's re-election, the nation endured one of its most tragic school shootings to date when 20 children and six adults were shot to death at the Sandy Hook Elementary School in Newtown, Connecticut, on December 14, 2012. Two days after the attack, Obama delivered a speech at an interfaith vigil for the victims in Newtown and discussed a need for change in order to make schools safer while alluding to implementing stricter gun-control measures. "These tragedies must end," Obama stated. "In the coming weeks, I'll use whatever power this office holds to engage my fellow citizens—from law enforcement, to mental-health professionals, to parents and educators—in an effort aimed at preventing more tragedies like this, because what choice do we have? We can't accept events like these as routine. Are we really prepared to say that we're powerless in the face of such carnage, that the politics are too hard?"

Obama achieved a major legislative victory on January 1, 2013, when the Republican-controlled House of Representatives approved a bipartisan agreement on tax increases and spending cuts, in an effort to avoid the looming fiscal cliff crisis (the Senate voted in favor of the bill earlier that day). The agreement marked a productive first step toward the president's re-election promise of reducing the federal deficit by raising taxes on the extremely wealthy—individuals earning more than $400,000 per year and couples earning more than $450,000, according to the bill. Prior to the bill's passage, in late 2012, tense negotiations between Republicans and Democrats over spending cuts and tax increases became a bitter political battle until Vice President Joe Biden managed to hammer out a deal with Republican Senate Minority Leader Mitch McConnell. Obama pledged to sign the bill into law.

Second Term

Barack Obama officially began his second term on January 21, 2013, when U.S. Chief Justice John Roberts administered the oath of office. The inauguration was held on Martin Luther King Jr. Day, and civil-rights activist Myrlie Evers-Williams, the widow of Medgar Evers, gave the invocation. James Taylor, Beyoncé Knowles and Kelly Clarkson sang at the ceremony, and poet Richard Blanco read his poem "One Today."

In his inaugural address, Obama called the nation to action on such issues as climate change, health care and marriage equality. "We must act, knowing that our work will be imperfect. We must act, knowing that today's victories will be only partial and that it will be up to those who stand here in four years and 40 years and 400 years hence to advance the timeless spirit once conferred to us in a spare Philadelphia hall," Obama told the crowd gathered in front of the U.S. Capitol building.

The Obamas attended two official inauguration balls, including one held at the Walter E. Washington Convention Center. There the first couple danced to the Al Green classic "Let's Stay Together," sung by Jennifer Hudson. Alicia Keys and Jamie Foxx also performed.

After the inauguration, Obama led the nation through many challenges—none more difficult, perhaps, than the terrorist bombings of the Boston Marathon on April 15, 2013, which killed three people and left more than 200 injured. At a memorial service in Boston three days after the bombings, he told the wounded, "Your country is with you. We will all be with you as you learn to stand and walk and, yes, run again. Of that I have no doubt. You will run again." And he applauded the city’s response to the tragedy. "You’ve shown us, Boston, that in the face of evil, Americans will lift up what’s good. In the face of cruelty, we will choose compassion."

In the same month, Obama also found his efforts for gun-control measures thwarted in Congress. He had supported legislation calling for universal background checks on all gun purchases and a ban on sales of assault weapons and high-capacity magazines. When the bill was blocked and withdrawn, Obama called it “a pretty shameful day for Washington.”

By June, Obama had suffered a significant drop in his approval ratings in a CNN/ORC International poll. In the wake of allegations of the Internal Revenue Service targeting conservative political organizations seeking tax-exempt status and accusations of a cover-up in the terrorist killings of U.S. Ambassador to Libya Christopher Stevens and three others at a diplomatic post in Benghazi, Libya, Obama’s approval rating declined to only 45 percent—his lowest rating in more than 18 months.

Experts also attributed the ratings slide to new revelations about the extent of the U.S. National Security Agency’s surveillance program. Obama defended the NSA's email monitoring and telephone wiretapping during a visit to Germany that June. "We are not rifling through the emails of German citizens or American citizens or French citizens or anyone else,” he said. "The encroachment on privacy has been strictly limited." Obama stated that the program had helped stop roughly 50 threats.

In early July 2013, President Obama made history when he joined former President George W. Bush in Africa to commemorate the 15th anniversary of al-Qaeda’s first attack on American targets, the U.S. embassies in Tanzania and Kenya. The event marked the first meeting between two U.S. presidents on foreign soil in commemoration of an act of terrorism.

Later that month, Obama spoke out about the outrage that followed a Florida jury’s decision to acquit George Zimmerman in the murder of African-American teen Trayvon Martin. "When Trayvon Martin was first shot, I said that this could have been my son,” the president remarked at a White House press conference. “Another way of saying that is Trayvon Martin could have been me 35 years ago." Obama explained that this particular case was a state matter, but he discussed how the federal government could address some of the legislative and racial issues highlighted by the incident.

International Challenges

Obama found himself grappling with an international crisis in late August and September 2013 when it was discovered that Syrian leader Bashar al-Assad had used chemical weapons against civilians. While saying that thousands of people, including over 400 children, had been killed in the chemical attacks, Obama called Syria's actions "a serious national security threat to the United States and to the region, and as a consequence, Assad and Syria needs to be held accountable."

The president worked to persuade Congress and the international community at large to take action against Syria, but found a majority on Capitol Hill opposed to military involvement. Obama then announced an alternative solution on September 10, 2013, by stating that if al-Assad agreed with the stipulations outlined in a proposal made by Russia to give up its chemical weapons, then a direct strike against the nation could be avoided. Al-Assad acknowledged the possession of chemical weapons and ultimately accepted the Russian proposal.

Later that month, Obama made diplomatic strides with Iran. He spoke with Iranian President Hassan Rouhani on the phone, which marked the first direct contact between the leaders of the two countries in more than 30 years. This groundbreaking move by Obama was seen by many as a sign of thawing in the relationship between the United States and Iran. "The two of us discussed our ongoing efforts to reach an agreement over Iran's nuclear program," reported Obama at a press conference in which he expressed optimism that a deal could be reached to lift sanctions on Iran in return for that country’s willingness to halt its nuclear development program.

Domestic Policies and Problems

Obama found himself struggling on the domestic front in October 2013. A dispute over the federal budget and Republican desires to defund or derail the Affordable Care Act caused a 16-day shutdown of the federal government. After a deal had been reached to end the shutdown, Obama used his weekly address to express his frustration over the situation and his desire for political reform: "The way business is done in Washington has to change. Now that these clouds of crisis and uncertainty have lifted, we need to focus on what the majority of Americans sent us here to do—grow the economy, create good jobs, strengthen the middle class, lay the foundation for broad-based prosperity, and get our fiscal house in order for the long haul."

The Affordable Care Act continued to come under fire in October after the failed launch of HealthCare.gov, the website meant to allow people to find and purchase health insurance. Extra technical support was brought in to work on the troubled website, which was plagued with glitches for weeks. The health care law was also blamed for some Americans losing their existing insurance policies, despite repeated assurances from Obama that such cancellations would not occur. According to the Chicago Tribune, Obama insisted that the insurance companies—and not his legislation—caused the coverage change. "Remember, before the Affordable Care Act, these bad-apple insurers had free rein every single year to limit the care that you received, or used minor pre-existing conditions to jack up your premiums, or bill you into bankruptcy,” he said.

Under mounting pressure, Obama found himself apologizing regarding some health care changes. In an interview with NBC News, he said of those who lost their insurance plans, "I am sorry that they are finding themselves in this situation based on assurances they got from me." Obama pledged to find a remedy to this problem, saying, "We are going to do everything we can to deal with folks who find themselves in a tough position as a consequence of this."

Managing Foreign Crises

The fall of 2013 brought Obama additional challenges in the area of foreign relations. In October 2013, German Chancellor Angela Merkel revealed that the NSA had been listening in to her cell phone calls. "Spying among friends is never acceptable," Merkel told a summit of European leaders. In the wake of these controversies, Obama saw his approval rating drop to a new low in November 2013. Only 37 percent of Americans polled by CBS News approved of the job he was doing as president, while 57 percent disapproved of his handling of the job.

Echoes of the Cold War also returned after civil unrest and protests in the capital city of Kiev led to the downfall of Ukrainian President Viktor Yanukovych's administration in February 2014. Russian troops crossed into Ukraine to support pro-Russian forces and the annexation of the province of Crimea. In response, Obama ordered sanctions targeting individuals and businesses considered by the U.S. government to be Ukraine agitators or involved in the Crimean crisis. "In 2014 we are well beyond the days when borders can be redrawn over the heads of democratic leaders," Obama stated. The president said the sanctions were taken in close coordination with European allies and gave the U.S. "the flexibility to adjust our response going forward based on Russia's actions.”

In addition to the ongoing troubles in Ukraine, tensions between Israelis and Palestinians erupted into violence in Gaza during the summer of 2014. At the same time, tens of thousands of Central American children were being apprehended at the U.S.-Mexico border after making the perilous crossing alone. Many Republicans called for the rapid deportation of these illegal immigrants, while others considered the situation a humanitarian crisis. Another of the president's woes came from the legislative branch. Speaker of the House John Boehner launched an effort to sue Obama for overstepping his executive powers with some of his actions regarding the Affordable Care Act.

In August 2014, Obama ordered the first airstrikes against the self-proclaimed Islamic State, also known as ISIS or ISIL, which had seized large swathes of Iraq and Syria and conducted high-profile beheadings of foreign hostages. The following month, the U.S. launched its first attacks on ISIS targets in Syria, although the president pledged to keep combat troops out of the conflict. Several Arab countries joined in the airstrikes against the extremist Islamic militant group. "The only language understood by killers like this is the language of force,” Obama said in a speech to the United Nations. “So the United States of America will work with a broad coalition to dismantle this network of death."

Presidency After 2014 Elections

That November, Obama had to cope with new challenges on the home front. Republicans made an impressive showing on Election Day and gained a majority in the Senate, meaning that Obama would have to contend with Republicans controlling both houses of Congress for the final two years of his term.

Obama flexed his presidential power in December by moving to reestablish diplomatic relations with Cuba for the first time in more than 50 years. The policy change came after the exchange of American citizen Alan Gross and another unnamed American intelligence agent for three Cuban spies. In a speech at the White House, Obama explained that the dramatic shift in Cuban policy would "create more opportunities for the American and Cuban people and begin a new chapter among the nations of the Americas."

In renewing diplomatic ties with Cuba, Obama announced plans "to increase travel, commerce and the flow of information to and from Cuba." The long-standing U.S. economic embargo on Cuba, however, remained in effect and could only be removed with the approval of Congress. Obama may not be able to sway Congress to agree on this policy shift as leading Republicans—including Boehner, McConnell and Florida Senator Marco Rubio—all spoke out against Obama's new Cuba policies.

In his 2015 State of the Union address, Obama declared that the nation was out of recession. "America, for all that we've endured; for all the grit and hard work required to come back . . . know this: The shadow of crisis has passed," he said. He went on to share his vision for ways to improve the nation through free community college programs and middle-class tax breaks.

With Democrats outnumbered by Republicans in both the House and the Senate, Obama threatened to use his executive power to prevent any tinkering by the opposition on his existing policies. "We can’t put the security of families at risk by taking away their health insurance, or unraveling the new rules on Wall Street, or refighting past battles on immigration when we’ve got to fix a broken system," he said. "And if a bill comes to my desk that tries to do any of these things, I will veto it."

Not long after his State of the Union address, Obama traveled to India to meet with Prime Minister Narendra Modi. According to several news reports, Obama and Modi had reached a "breakthrough understanding" regarding India's nuclear power efforts. Obama told the Indian people in a speech given in New Delhi that "we can finally move toward fully implementing our civil nuclear agreement, which will mean more reliable electricity for Indians and cleaner, non-carbon energy that helps fight climate change." This agreement would also open the door to U.S. investment in India's energy industry.

Supreme Court Victories

The summer of 2015 brought two major U.S. Supreme Court wins for the Obama administration. The court upheld part of the president's Affordable Care Act regarding health care tax subsidies. Without these tax credits, buying medical insurance might have become too costly for millions of Americans.

On June 26, the U.S. Supreme Court also made marriage equality a reality with its 5-4 decision to overturn an earlier 6th Circuit Court of Appeals ruling that same-sex marriage bans in several states were constitutional. By reversing this earlier decision, the Supreme Court made same-sex marriage legal throughout the country. President Obama, who became the first president to voice support for same-sex marriage in May 2012, praised the court for affirming "that the Constitution guarantees marriage equality. In doing so, they've reaffirmed that all Americans are entitled to the equal protection of the law. That all people should be treated equally, regardless of who they are or who they love."
In his speech, Obama also said that the court's decision "is a consequence of the countless small acts of courage of millions of people across decades who stood up, who came out, who talked to parents—parents who loved their children no matter what. Folks who were willing to endure bullying and taunts, and stayed strong . . . and slowly made an entire country realize that love is love."
On the same day as this landmark decision, President Obama grappled with an incident of racial violence by speaking at the funeral of Reverend Clementa Pinckney, one of the nine African-Americans killed by a young white man during a Bible study meeting at the Emanuel AME Church in Charleston, South Carolina. In his eulogy for Pinckney, Obama said that the church’s late pastor "embodied the idea that our Christian faith demands deeds and not just words."

Iran Nuclear Deal

In July 2015, Obama announced that, after lengthy negotiations, the United States and five world powers had reached an agreement with Iran over its nuclear program. The deal would allow inspectors entry into Iran to make sure the country kept its pledge to limit its nuclear program and enrich uranium at a much lower level than would be needed for a nuclear weapon. In return, the U.S. and its partners would remove the tough sanctions imposed on Iran and allow the country to ramp up sales of oil and access frozen bank accounts.

As the administration began its effort to lobby Congress to endorse the deal, Obama made his first trip as president back to his father’s homeland of Kenya. In addition to having dinner with three-dozen relatives, some of whom he met for the very first time, Obama proudly proclaimed to a packed arena, “I am proud to be the first American president to come to Kenya—and of course I’m the first Kenyan-American to be president of the United States.”

Clean Power Plan

In August 2015, the Obama administration announced The Clean Power Plan, a major climate change plan aimed at reducing greenhouse gas emissions, the first-ever national standards to limit carbon pollution from coal-burning power plants in the United States. President Obama called the plan the "single most important step that America has ever made in the fight against global climate change."
The plan calls for aggressive Environmental Protection Agency regulations including requiring existing power plants to cut carbon dioxide emissions 32 percent from 2005 levels by 2030 and use more renewable energy sources like wind and solar power. Under the regulations, states will be allowed to create their own plans to reduce emissions and are required to submit initial plans by 2016 and final versions by 2018.

Critics quickly voiced loud opposition to the plan including Kentucky Senator Mitch McConnell, the Republican majority leader, who sent a letter to every governor in the United States urging them not to comply with the regulations. States and private companies, which rely on coal production for their economic livelihoods, are also expected to legally challenge the plan.

Despite the backlash from those sectors, President Obama remained steadfast in his bold action to address climate change. "We've heard these same stale arguments before," he said in an address from the White House. "Each time they were wrong."

He added: "We're the first generation to feel the impact of climate change and the last generation that can do something about it."

2015 Paris Climate Conference

In November 2015, Obama further demonstrated his commitment to environmental issues as a primary player in the international COP21 summit held outside of Paris, France. Addressing the gathered representatives of nearly 200 countries, Obama acknowledged the United States’ position as the second-largest climate polluter and the nation’s primary responsibility to do something about it. The resulting Paris Agreement requires all participating nations to reduce greenhouse gas emissions in an effort to limit the rise of global temperatures over the ensuing century and also to allocate resources for the research and development of alternative energy sources. President Obama praised the agreement for establishing the “enduring framework the world needs to solve the climate crisis” and pledged that the United States would cut its emissions more than 25 percent by 2030.

Gun Control

Entering his final year as President of the United States, in early January 2016 Obama held a press conference to announce a new series of executive orders related to gun control. Citing examples such as the 2012 mass shooting at Sandy Hook elementary school, the president shed tears as he called on Congress and the gun lobby to work with him to make the country safer. His measures, which have met with vehement opposition from members of both the Republican and Democratic Parties, as well as gun advocacy groups such as the NRA, would implement more thorough background checks for gun buyers, stricter governmental oversight and enforcement of gun laws, better information sharing regarding mental health issues as related to gun ownership and investment in gun safety technology. According to a 2015 Gallup poll, most Americans favor some kind of stricter regulations of gun sales.

Final Year in Office

Entering his final year as President of the United States, in early January 2016 Obama held a press conference to announce a new series of executive orders related to gun control. Citing examples such as the 2012 mass shooting at Sandy Hook elementary school in Connecticut, the president shed tears as he called on Congress and the gun lobby to work with him to make the country safer. His measures, which have met with vehement opposition from members of both the Republican and Democratic Parties, as well as gun advocacy groups such as the NRA, would implement more thorough background checks for gun buyers, stricter governmental oversight and enforcement of gun laws, better information sharing regarding mental health issues as related to gun ownership and investment in gun safety technology. According to a 2015 Gallup poll, most Americans favor some kind of stricter regulations of gun sales.

Shortly after the press conference, on January 12, 2016, Barack Obama delivered what would be his final State of the Union address. Diverging from the typical policy-prescribing format, Obama’s message for the American people was centered around themes of optimism in the face of adversity, asking them not to let fears about security or the future get in the way of building a nation that is “clear-eyed” and “big-hearted.” This did not prevent him from taking thinly disguised jabs at Republican presidential hopefuls for what he characterized as their “cynical” rhetoric, making further allusions to the “rancor and suspicion between the parties” and his failure as president to do more to bridge that gap. But Obama also took the opportunity to tout his accomplishments, citing the Affordable Care Act, diplomatic progress with Iran and Cuba, the legalization of gay marriage and profound economic recovery as among them.

Further indicating his unwillingness to accept a “lame duck” status, two months later Obama made two important moves to attempt to cement his legacy. On March 10 he met at the White House with newly elected Canadian Prime Minister Justin Trudeau in the first official visit by a Canadian leader in nearly 20 years. Central among the topics addressed during their meeting—which also included trade, terrorism and border security—was climate change, with the two leaders promising a commitment to building an international “low-carbon global economy.” Trudeau’s apparent concern for environmental issues and generally liberal agenda stand in contrast to his predecessor, Stephen Harper, with whom President Obama enjoyed strained relations due in part to Obama’s unwillingness to allow for the construction of the Keystone XL pipeline.

A week after his meeting with Trudeau, Obama held a press conference at the White House to present 63-year-old U.S. Court of Appeals chief judge Merrick Garland as his nominee for the Supreme Court seat vacated with the unexpected death of conservative stalwart Antonin Scalia. Though Garland is considered a moderate “consensus” candidate, his nomination was immediately rebuffed by leaders of the Republican Party, who have repeatedly stated their intention to block any nominee put forward by President Obama, fearing that such a confirmation would tip the balance toward a more liberal-leaning court. In an allusion to the political standoff, President Obama closed his remarks about Garland by saying, “I am fulfilling my constitutional duty. I’m doing my job. I hope that our senators will do their jobs, and move quickly to consider my nominee.” During his presidency, Obama already filled two seats in the Supreme Court, with Sonia Sotomayor and Elena Kagan, though both were confirmed when there was a Democratic-majority Senate.

Leaving the Senate to weigh their options regarding his nomination of Merrick, President Obama set out on a historic mission to Cuba on March 20. The first sitting American president to visit the island nation since 1928, Obama made the three-day visit—accompanied by First Lady Michelle Obama and their daughters Malia and Sasha. Obama's visit was part of a larger program to establish greater cooperation between the two countries, the foundations of which were laid in late 2014, when Obama and Cuban president Raul Castro announced the normalizing of diplomatic relations for the first time since 1961. At the top of the agenda during the milestone meeting between the two leaders were human rights, the U.S.’s economic embargo on Cuba and Guantanamo Bay. Following their first conversation at the Palace of the Revolution, Castro and Obama held a joint press conference broadcast on state television during which they fielded questions from the press. While they acknowledged its complexities, both also professed a shared optimism about the road ahead.

Monday, March 28, 2016

Daftar-daftar Istilah Komputer









1.      Adaptor : Komponen elektronik yang berfungsi untuk mengubah arus bolak-balik (AC [Alternating Current]) menjadi arus searah (DC [Direct Current]).
2.      Address bus : Digunakan untuk menandakan lokasi sumber atau pun tujuan pada proses transfer data. Pada jalur ini, CPU akan mengirimkan alamat memori yang akan ditulis atau dibaca. Address base biasanya terdiri atas 16, 20, 24, atau 32 jalur paralel.
3.      ALU : Bagian CPU yang memproses data untuk melakukan operasional dan perhitungan.
4.      Array Processor / Co – Processor : Unit prosesor tambahan yang digunakan untuk mempercepat proses perhitungan data.
5.      Backup : Salinan perangkat lunak atau data yang tersimpan pada media penyimpanan.
6.      Beep : Bunyi speaker yang dikeluarkan komputer pada proses POST atau pada saat ada kesalahan/gangguang tertentu. Suara yang muncul melalui speaker komputer, umunya menunjukkan adanya kesalahan dalam program yang sedang berjalan. Beep dapat ditambahkan dalam program yang dibuat dengan menyisipkan kode ASCII 7.
7.      Benchmark : Adalah sebagai perbandingan antar periferal, untuk mengetahui kinerja secara pasti dari komputer/periferal berdasarkan pada standar yang telah ditentukan oleh pihak tertentu.
8.      Binaty digit (bit) : Nomor yang digunakan dalam kode biner.
9.      BIOS (Basic Input Output System) : Software yang dipasang pada chip komputer untuk mengatur operasi dasar seperti layar, harddisk, memory, VGA, dll. Bagian dari sistem operasi yang bisa mengidentifikasi set program yang digunakan untuk mem - boot komputer, sebelum menempatkan disket sistem. BIOS terdapat di ROM (Read Only Memory) dari sistem dan umumnya tersimpan secara permanen. Program yang digunakan mikroprosesor untuk menyalakan komputer. BIOS juga mengatur aliran data antara sistem operasi komputer dan perangkat tambahan yang terhubung pada komputer.
10.  Bluetooth : Adalah koneksi wireless di bawah standar IEEE 802.15.1, berkecepatan rendah dan berjangkauan pendek (± 8M), biasanya digunakan untuk mentransfer data antar mobile phone, menghubungkan keyboard/mouse dengan CPU (yang wireless) dan headset (PAN).
11.  Booting Up : Proses ROM mengirim perintah ke CPU untuk memulai operasional saat komputer dinyalakan.
12.  Bottleneck : Adalah kondisi dimana akses data pada suatu periferal komputer terlambat. Keterlambatan ini disebabkan karena ketidakmampuan suatu periferal menampung semua data yang ditransmisikan kepada periferal tersebut.
13.  Bridges : Perangkat jaringan yang berfungsi untuk menghubungkan jaringan yang menggunakan sambungan fisik yang berbeda. Misalnya menghubungkan pengkabelan twisted pair dengan coaxial cable.
14.  Browser : Program aplikasi yang digunakan untuk menjelajahi layanan internet.
15.  Bus : Saluran yang terdiri dari sekumpulan jalur yang sejenis. Sekumpulan kabel yang merupakan alat transportasi informasi ke semua peralatan dalam sistem. Informasi tersebut dapat berupa data, perintah atau alamat.
16.  Cache Memory : Memori berkecepatan tinggi yang mampu bekerjasama dengan CPU, bertindak sebagai buffer antara CPU dan RAM.
17.  Cathode Ray Tube (CRT) : Alat penghasil gambar pada layar monitor yang menggunakan sinar elektron yang men – scan permukaan layar monitor.
18.  Central Processing Unit (CPU) : Bagian komputer yang berisi unit kontrol dan aritmetika. CPU membawa perintah program.
19.  Chip : Silikon kecil yang dilapisi jutaan sirkuit dan gerbang logika.
20.  Chipset : Kombinasi chip yang berfungsi untuk menjembatani aliran data dan mengontrol beberapa periferal komputer.
21.  CLI (Command Line Interface) : Tampilan sebuah OS yang menggunakan tampilan teks dan menggunakan perintah – perintah tertentu dalam menjalankan OS tersebut.
22.  Client : Suatu (individu) komputer (biasanya berkemampuan lebih rendah) yang dapat berinteraksi dengan komputer utama (berkemampuan lebih tinggi) pada suatu jaringan.
23.  Clock : Rangkaian pembangkit frekuensi. Sumber utama dari pulsa elektronik komputer. Clock digunakan untuk menyamakan operasi semua elemen komputer.
24.  CMOS (Complementary Metal Oxide Semiconductor) : RAM kecil berukuran 64 byte yang menyimpan setting BIOS saat komputer sedang dimatikan.
25.  Command Prompt : Aplikasi DOS pada Sistem Operasi Windows.
26.  Compiller : Program yang menterjemahkan perintah dari bahasa tingkat tinggi ke kode mesin.
27.  Console : sama seperti Command Prompt.
28.  Control bus : Control bus digunakan untuk mengontrol penggunaan serta akses ke data base dan address base. Terdiri atas 4 sampai 10 jalur paralel.
29.  Core : Bagian inti dari sebuah prosesor.
30.  Crack : Sebuah program kecil yang berfungsi untuk membuat software yang bersifat shareware atau komersial agar dapat terus digunakan (full versi).
31.  Data bus : Merupakan jalur – jalur perpindahan data antar modul dalam sistem komputer. Karena pada masing – masing jalur saluran hanya dapat membawa 1 bit data, oleh karena itu jumlah saluran menentukan jumlah bit yang dapat ditransfer pada suatu saat. Lebar data base ini menentukan kinerja sistem secara keseluruhan. Sifatnya Bidirectional, artinya CPU dapat membaca dan menerima data melalui data bus. Data bus biasanya terdiri atas 8, 16, 32, atau 64 jalur paralel.
32.  Database (software) : Sekelompok informasi yang tersimpan di file yang dapat ditemukan dengan mudah.
33.  Desktop : Tampilan menu pada OS; biasanya terdapat icon dan wallpaper; jenis casing yang berbentuk mendatar / horizontal.
34.  Desktop Publishing : Sistem yang menghasilkan media cetak, memakai PC yang dilengkapi dengan software khusus.
35.  DMA (Direct Memory Access) : Akses memori secara langsung. Chip yang berfungsi untuk mengendalikan proses pengaksesan memori secara langsung. Alat pengendali memori yang membantu mempercepat kerja CPU dalam proses pengolahan data.
36.  Dissasembler : Program yang mengubah kode mesin menjadi bahasa assembler.
37.  Driver : Software yang digunakan untuk mengendalikan hardware agar mampu bekerja atau agar dapat bekerja secara optimal.
38.  Direktori : Sama dengan folder.
39.  Disc : Piringan penyimpanan pada media penyimpanan jenis optik.
40.  Disk Drive : Media penyimpanan data pada komputer atau perangkat portable lain.
41.  DOS (Disk Operating System) : Program untuk PC yang membawa perintah teks untuk menjalankan program.
42.  Elemen komputer : Kesatuan komponen penyusun komputer dan merupakan bagian penting dari komputer agar komputer dapat digunakan.
43.  EXT2 : Sistem partisi format Linux.
44.  Extension : Format sebuah file yang menentukan jenis dan aplikasi yang membuka file tersebut. Ada ribuan atau lebih jenis ekstension. Contoh ekstension pada file misalnya *.exe (executable), *.dll (dinamic link library), *.sys (system file), *.bat (MS – DOS batch file), *.jpg (JPEG), *.png (portable network graphic), *.flac (free losseness audio codec), *.mp3 (MPEG 3 layer audio), *.avi (audio video interleave), dan lain lain.
45.  E-Mail (Electronic Mail) : Metode pengiriman pesan antar komputer dengan jaringan.
46.  FAT (File Allocation Table) : Sistem media penyimpanan format Windows/sistem partisi harddisk.
47.  Floppy Disk : Media penyimpanan data berbentuk piringan magnetik dan dapat menyimpan data berukuran kecil.
48.  Freeware : Merupakan software yang bersifat gratis yang dapat terus digunakan; freeware bisa diperbanyak dan didistribusikan selama tidak untuk tujuan komersial (perdagangan atau bisnis) dan hanya dapat digunakan untuk perseorangan/pribadi.
49.  FSB (Front Side Bus) : Adalah kecepatan koneksi dari bus yang mempunyai satuan kecepatan dalam melakukan pertukaran data, satuan yang digunakan adalah Mega Hertz (MHz).

50.  FTP (File Transfer Protocol) : Merupakan teknologi yang digunakan untuk melakukan transfer file dari satu komputer ke komputer lain di internet dengan menggunakan konsep client server. Bluetooth juga mendukung fungsi ini.

Monday, February 29, 2016

Soal IPA SD/MI PERSIAPAN UJIAN NASIONAL (UN) SD










Berilah tanda silang (x) pada huruf A, B, C, atau D di depan jawaban yang benar!
1. Fungsi bagian tumbuhan bakau yang paling tepat adalah ….
A. akar untuk menopang batang bakau agar tidak roboh jika diterpa ombak
B. daun berbentuk lebar dan banyak untuk bernapas pada waktu siang hari
C. batang perdu berguna menjalar ke tumbuhan lain yang ada di sekitarnya
D. kulit batang keras untuk menyimpan cadangan air dan tidak mudah busuk
Jawaban: A
Pembahasan: Akar tumbuhan bakau sering disebut sebagai pneumatofor, karena mampu mengambil oksigen dari udara meskipun terjadi pasang surut.
2. Perhatikan kelompok hewan berikut!
1. Sapi.
2. Kerbau.
3. Rusa.
4. Kambing.
Hewan yang memiliki jenis makanan yang sama dengan kelompok hewan di atas adalah ….
A. kucing
B. kelinci
C. kadal
D. musang
Jawaban: B
Pembahasan: Dikarenakan sapi, kerbau, rusa, dan kambing adalah termasuk jenis hewan herbivorA, maka dari pilihan yang diberikan hanya kelinci yang termasuk di dalamnya. Kucing termasuk ke dalam jenis karnivora, kadal termasuk ke dalam jenis insektivora, dan musang adalah termasuk jenis omnivore.
3.    Di kebun Pak Joko terdapat tumbuhan berikut.



Pak Joko akan mengembangbiakkan tanaman tersebut. Cara yang paling tepat dilakukan Pak Joko adalah ….
A. menanam bijinya
B. mencangkok batangnya
C. menanam tunasnya
D. menanam umbinya
Jawaban: C


Pembahasan: Pohon pisang, bamboo, dan tebu adalah jenis tanaman yang pengembangbiakannya dengan cara tunas.


4. Perhatikan tabel di bawah ini!
No. Tumbuhan                  Bentuk Adaptasi
1. Jati                  p.batang berdaging dan kulit tebal untuk menyimpan air
2. Kaktus         q. akar lebat untuk menjaga keseimbangan agar tidak terbalik
3. Teratai         r. meranggas di musim kemarau untuk mengurangi penguapan
4. Enceng gondok         s. daun lebar dan tipis untuk mempercepat proses penguapan
Pasangan bentuk adaptasi tumbuhan yang semua benar adalah ….
A. 1 – q; 2 – r; 3 – s; 4 – p 
B. 1 – r ; 2 – q; 3 – p; 4 – s
C. 1 – r ; 2 – p ; 3 – s ; 4 – q
D. 1 – s ; 2 – q ; 3 – r ; 4 – p
Jawaban: C
Pembahasan: Pohon jati menggugurkan daunnya pada musim kemarau. Hal ini bertujuan untuk mengurangi penguapan. Kaktus memiliki batang berdaging dan kulit tebal untuk menyimpan air. Teratai memiliki daun yang lebar dan tipis untuk mempercepat proses penguapan. Sedangkan, enceng gondok memiliki akar yang lebat untuk menjaga keseimbangan agar tidak terbalik.

5.  Perhatikan gambar di bawah ini!


Ciri khusus hewan sebagaimana pada gambar ketika mempertahankan hidup adalah ….
A. sengat di ujung ekor untuk menyerang musuh
B. tubuh berbuku-buku untuk memudahkan gerak
C. dua penjepit untuk memasukkan makanan
D. rangka luar memberi bentuk tubuh


Jawaban: A


Pembahasan: Kalajengking memiliki ciri-ciri, antara lain memiliki sengat di ujung ekor untuk menyerang musuh dan memiliki tubuh berbuku-buku untuk memudahkan gerak.Sedangkan, hewan yang memiliki dua penjepit untuk memasukkan makanan dan rangka luar untuk memberi bentuk tubuh adalah cirri-ciri kepiting.

6. Ciri-ciri hewan yang berkembang biak dengan cara melahirkan adalah ….
        A. mengalami masa kehamilan dan tanpa daun telinga
        B. embrio tumbuh di luar tubuh induk dan memiliki kelenjar susu
        C. tanpa memiliki kelenjar susu dan tubuh ditumbuhi rambut
        D. embrio tumbuh di dalam rahim dan memiliki kelenjar susu
      Jawaban: D
Pembahasan: Hewan yang berkembang biak dengan melahirkan disebut hewan vivipar.Hewan yang melahirkan biasanya memiliki cirri berdaun telinga, bernapas menggunakan paru-paru, dan memiliki putting susu. Hewan yang berkembang biak dengan cara ini juga disebut mamalia, karena memiliki kelenjar susu. Contoh, tikus, kelinci, kuda, dan lumba-lumba. 

7. Manfaat bagian pohon karet bagi manusia dan lingkungannya adalah ….
    A. batang untuk bangunan dan getah untuk industri ban
    B. batang untuk membuat kertas dan akar untuk menahan erosi
    C. batang untuk bahan bangunan dan getah untuk bahan karet
    D. getah untuk bahan ban dan akar untuk menahan erosi
              Jawaban: D
     Pembahasan: Pohon karet dapat dimanfaatkan getahnya untuk digunakan menjadi bahan  dasar                  pembuatan ban, dan akarnya untuk menahan pengikisan tanah/erosi.

8.  Daun jati digunakan juru masak di Jawa Tengah dan Yogyakarta ketika membuat gudeg, supaya ….
   A. tidak cepat basi, karena getahnya mencegah pertumbuhan bakteri
   B. memiliki aroma harum, karena getahnya sangat harum
   C. mempunyai rasa gurih, karena getahnya larut dalam sayur
   D. berwarna coklat kemerahan, karena getahnya larut dalam sayur
  Jawaban: D
     Pembahasan: Daun pohon jati dapat digunakan sebagai pewarna sayur gudeg, karena daunnya yang            berwarna cokelat kemerahan dan memiliki jenis getah yang larut ke dalam air.  

9.  Bagian mata yang bertanda X pada gambar di samping berfungsi untuk ….
A. menerima rangsang cahaya dan melindungi kornea mata
B. mengatur banyaknya cahaya yang masuk ke mata
C. mengubah cahaya menjadi bayangan benda
D. mengatur cahaya agar jatuh tepat pada retina
Jawaban: B
Pembahasan: Kornea bertugas menerima rangsang cahaya dan meneruskannya ke bagian yang lebih dalam. Lensa mata bertugas untuk mengatur cahaya agar jatuh tepat pada retina.


10. Proses yang terjadi pada organ  K pada gambar adalah ….
A. penyesuaian kelembaban udara yang masuk
B. pertukaran gas oksigen dan air
C. penyaringan udara yang dihirup
D. pertukaran karbondioksida dan oksigen
Jawaban: D
Pembahasan: Di bagian alveolus terjadi pertukaran Oksigen dan karbondioksida .Setelah itu, karbondioksida dari paru-paru menuju ke tenggorokan, kemudian ke lubang hidung untuk dikeluarkan dari dalam tubuh.