Question

fill in the blank below with the word that best completes the sentence. natural selection leads to a process of change in a population over time.

Explanation:

In the context of biology (a subfield of Natural Science), natural selection is a key mechanism that drives evolution. Evolution is defined as the process of change in the heritable characteristics of a population over successive generations (or time). So the word that best completes the sentence is "evolution".

Answer:

evolution