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As of 2011, About How Large Was the World's Human

Question 20

Multiple Choice

As of 2011, about how large was the world's human population, and about how long will it take to add another billion?


A) 4.2 billion; expected to reach 5 billion by 2020.
B) 7 billion; expected to reach 8 billion by 2025.
C) 1 billion;  expected to reach 2 billion in a decade.
D) 10 billion; expected to reach 11 billion by 2050.

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