How long did it take for the human population on Earth to go from two billion to six billion? less than 50 years less than 100 years less than 150 years less than 200 years - Qammunity

How long did it take for the human population on Earth to go from two billion to six billion? less than 50 years less than 100 years less than 150 years less than 200 years

asked Jan 13, 2019 57.2k views

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