Assume that two species are coexisting in the same environment. Species A has little gene pool variation, whereas species B has great variety in its gene pool. During a dramatic environmental change, which event is MOST probable? A. Species A and B will merge into one species. B. Species A and B will endure great surges of mutations. C. Species A will evolve, whereas species B will have few surviving members. D. Species A will become extinct, whereas species B will have surviving members.