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.
Correct Answer:

Verified
Correct Answer:
Verified
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