Regardless of the type of individuals composing a species, it interacts as a unit with other species, with which it shares the environment. A species is a genetic unit . A species consists of a large, intercommunicating gene pool, and individuals are temporary holding vessels of a portion of the gene pool. A species is a community of gene pools in demes of each individual species. This aspect allows integration of population genetics into questions regarding speciation.
Species are determined on the basis of distinctiveness rather degree of difference.
It was modified to address earlier criticisms and to resurrect it. This concept avoids problems of biological species concept by being compatible with a greater range of reproductive modes. This concept is applicable to extinct organisms, and it is compatible with various modes of speciation. It, however, is not a mechanistic definition as it addresses only the products of evolution. Highly controversial, but has had limited support.