Question

fitness in biology is having lots of muscles the ability to survive and reproduce how strong you are

Explanation:

In biology, fitness refers to an organism's ability to survive in its environment and reproduce successfully. This concept is central to evolutionary theory, as organisms with higher fitness are more likely to pass on their genes to the next generation. The options "having lots of muscles" and "how strong you are" are more related to physical fitness in a general, non - biological context.

Answer:

the ability to survive and reproduce