What Is Meant by Biodiversity

What is meant by biodiversity?

A) The variety of plants, animals, and microorganisms that exist in earth's environment.
B) The ability of an animal to live in various different ecosystems.
C) The ability of a plant to act like an animal, i.e. consume animals, insects, and microorganisms. (e.g. Venus fly trap) .
D) All of the above.
E) None of the above.