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life on earth started 3.8 billion years ago
The best and most correct answer among the choices provided by the question is the second choice "China"
U.S. President Richard Nixon<span>'s </span>1972<span> visit to the People's Republic of China was an important step in formally </span>normalizing relations<span> between the United States and China.</span>
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<span>c.The United States enforced a military quarantine in international waters. </span>
