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Title: When did the human population reach 500 million people? Post by: Kellman on May 30, 2015 When did the human population reach 500 million people?
a. 400 years ago b. 1,000 years ago c. 4,000 years ago d. 10,000 years ago Title: Re: When did the human population reach 500 million people? Post by: randis_oddy on Jun 3, 2015 Content hidden
Title: Re: When did the human population reach 500 million people? Post by: Kellman on Jun 28, 2015 Just want to give you some feedback, your answer was right! Awesome
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