Title::world    World::growth    Billion::united    Nations::million    First::control    Which::human

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The distribution of human world population in 1994

A population is a summation of all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

In ecology, the population of a certain species in a certain area is estimated using the Lincoln Index. The area that is used to define a sexual population is defined as the area where inter-breeding is potentially possible between any pair within the area. The probability of interbreeding is greater than the probability of cross-breeding with individuals from other areas. Under normal conditions, breeding is substantially more common within the area than across the border.<ref>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref>

In sociology, population refers to a collection of humans. Demography is a social science which entails the statistical study of human populations. This article refers mainly to human population.

Population sections
Intro  Population genetics (ecology)   World human population   See also  References  External links  

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