We Are Usually Referring to Species Diversity When We Talk

We are usually referring to species diversity when we talk about biodiversity. However, genetic diversity is also important to ecological systems because diverse genes

A) Increase the efficiency and productivity of a system because all niches are filled.
B) Allow an individual organism to adapt to its changing environment.
C) Are necessary for a population to evolve in a changing environment.
D) Lead to diverse ecological processes in a biological community.
E) Are important for a balanced ecosystem.