How do social scientists determine pop. figures before census were taken?

Subject: How do social scientists determine pop. figures before census were taken?

Date: Tue Sep 6 17:02:26 2005
Posted by Jennifer
Grade level: 7-9 School: No school entered.
City: No city entered. State/Province: No state entered. Country: No country entered.
Area of science: Science History
ID: 1126044146.Sh

Message:


How can we figure out approximately how many people were on the earth in 
ancient times (e.g. 400 B.C.E)?

Re: How do social scientists determine pop. figures before census were taken?

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