Complex considerations of especially ecology, evolutionary biology, and organismal biology as applied especially to individual species of organisms.
Population biology is a term that is often applied to the study of organisms which, by necessity, are studied as populations rather than as individuals, e.g., microorganisms. It is not synonymous with population ecology, however, because of population biology's typically strong evolutionary emphasis (e.g., evolutionary ecology as well as evolutionary relationships), and it is not simply organismal biology since there is a strong population emphasis as well, i.e., as there must be when considering issues of population genetics, which also is highly relevant under the auspices of population biology.
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