Environmental Health Engineering Theory and Practice/Populations
In biology a population is all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding. The area of a sexual population is the area where inter-breeding is potentially possible between any pair within the area, and where the probability of interbreeding is greater than the probability of cross-breeding with individuals from other areas.
In sociology, population refers to a collection of humans and their entire race. Demography is a social science which entails the statistical study of human populations. Population, in a more simple term, is the number of people in a city or town, region, country or world; population is usually determined by a process called census (a process of collecting, analyzing, compiling and publishing data).