The evolutionary species concept states that for a population to be declared a separate species, it must:

A) not interbreed with any other population.
B) have diverged significantly from other populations.
C) occupy a different niche than any other population.
D) be morphologically different from any other population.
E) have undergone natural selection sometime in its history.

Evolutionary Species Concept

A definition of species based on evolutionary lineage, where a species is a lineage of populations which maintains its identity from other such lineages and has its own evolutionary tendencies and historical fate.

Natural Selection

The process by which organisms better adapted to their environment tend to survive and produce more offspring.

Morphologically Different

Having distinct form or structure, especially between groups of organisms or parts of the same organism.