What is the fitness of an organism?

A. The number of resources an organism uses

B. The environment the organism lives in

C. The ability to survive and reproduce

D. The total population of a species

its C

The answer is C. The ability to survive and reproduce.

Explanation:

The definition of biological fitness is "the ability to survive to reproductive age, find a mate, and produce offspring." In simpler terms, the more offspring an organism produces during its lifetime, the greater its biological fitness. (Courtesy of Google)