Question

As of 2011, about how large was the worlds 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.

Indicate one or more answer choices that best complete the statement or answer the question.

Answer

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