It took more than 100,000 years for the human population to grow to one billion individuals and took about ____ years to add five billion more.

Name: It took more than 100,000 years for the human population to grow to one billion individuals and took about ____ years to add five billion more.
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The human population reached one billion around the early 1800s and grew to six billion by the late 20th century, taking about 200 years to add five billion more.

It Took More Than 100,000 Years for the Human Population