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Population

All the organisms of a given species that live in a specified region / From Wikipedia, the free encyclopedia

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Population is the term typically used to refer to the number of people in a single area. Governments conduct a census to quantify the size of a resident population within a given jurisdiction.

The distribution of world population in 1994
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The term is also applied to animals, microorganisms, and plants, and has specific uses within such fields as ecology and genetics.