A Drawback of the Biological Species Concept Is That It

A drawback of the biological species concept is that it CANNOT be applied to:

A) populations of a single species living in different places.
B) plants, which do not physically come in contact with each other when transferring gametes the way that animals do.
C) highly polymorphic species.
D) extinct and asexual organisms.
E) All of these choices are correct.