If the world population continues to grow at its present pace, by 2050 the world's population will reach
a. 20 billion.
c. eight billion.
b. 12 billion.
d. six billion.

b. 12 billion.

Explanation:

According to the United Nations, the current project is that the world's population growth will slow down during the next decades. The current projection of the UN shows that the population will be of 10 billions in 2050. If the growth doesn't slow down, though, we can assume that the number will be slightly bigger.

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explanation: