Answer:
O b. gene flow
Explanation:
Populations tend to create more progeny than can survive to reproductive age.
Gene flow is not a requirement of natural selection. Details about natural selection can be found below.
Natural selection is the process by which living organisms become better adapted or suited to their natural habitat or environment.
Natural selection is the primary cause of evolution and is determined by the following characteristics of a population of organisms:
Therefore, gene flow is not a requirement of natural selection.
Learn more about natural selection at: https://brainly.com/question/9830102
