Ecological species concept might differentiate species on the basis of specific dietary requirements.
Ecological species concept is the one that classifies organisms on the basis of the resources and the niches they share. The advantage of this classification is that each organism remains its own niche and therefore can functional properly in its environment. The concept of given by Ernst Mayr.
Species is the lowermost level of classification in the taxonomical hierarchy. It is comprised of species that possess nearly similar kind of characteristics. They are also able to mate with each other to produce fertile offspring.
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