It took 130 years for world population to increase from 1 billion to 2 billion. What span of time did it take for world population to grow from 5 billion to 6 billion?
A.6 years
B.12 years
C.25 years
D.50 years
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12 year is the correct answer
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It took 12 years for the world population to grow from 5 billion to 6 billion
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