Species

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A '''species''' is a reproductively isolated, independent evolutionary unit which occupies a certain [[Niche|niche]]. By definition, species are in biology "the lowest-level classifactory or taxonomic unit for biological organisms" (Keller and Lloyd, 1992). In biology it is a taxonomic group whose members can interbreed: a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. It is one of the basic units of biological classification. The two defining features are '''interaction''' and '''similarity''': frequent interaction and interbreeding leads to similar individuals, which can be classified by different taxonomic groups. classes, and categories, and similar individuals more frequently interact than dissimilar ones. The rise of a new species from an ancestor is called [[Speciation|speciation]]. A number of speciations leads to a [[Phylogenetic_Tree|phylogenetic tree]]. == Links == * Wikipedia entry for [http://en.wikipedia.org/wiki/Species species] == References == * Evelyn Fox Keller and Elisabeth A. Lloyd, "Keywords in Evolutionary Biology", Harvard University Press, 1992 [[Category:Evolutionary Principles]]

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