Which of the following is true about natural selection?

A. It always results in bigger, stronger individuals

B. It means that certain species have a programmed plan for evolution

C. It acts on existing heritable variation

D. It can cause an individual to become better adapted over its lifetime.

Natural selection acts on existing heritable variation

Answer: Option C

Explanation:

Natural selection is a process that occurs in nature as a key to evolution. It also goes hand with the survival of the fittest. Nature always selects the best trait to survive or get accustomed to the surrounding by undergoing modifications.

It acts on the genotype of the existing generation and causes variation in the future generation. So the population over generations get to have acquired the variations in their body, structure so that it is adaptable to the surrounding.