What is significant about the global population growth from 5 billion to 7 billion people?

a. it is 3.5 times the size of the Earth's population at the beginning of the twentieth century.
b. it took less time to happen than any of the previous population growths.
c. the growth rate is slowing down.
d. it is double the size of the Earth's population in 1960.


b

Language Arts & World Languages

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