The biological species concept emphasizes the ability of two individuals to successfully produce viable, fertile offspring.
The Biological Species Concept defines a species taxon as a group of organisms that can successfully interbreed and produce fertile offspring.
According to that concept, a species' integrity is maintained by interbreeding within a species as well as by reproductive barriers between organisms in different species.
The biological species concept (BSC) was designed to aid understanding of biological diversity, particularly the ubiquitous observation that sexually reproducing organisms exist in more or less distinct phenotypic and genetic clusters rather than in a continuum of forms.
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