3.Explain what microevolution is? What are three ways that variation occurs?

Microevolution is a change in gene frequency within a population. This change is due to four different processes. Mutation, Natural Selection, gene flow and genetic drift. Microevolution is when a small scale changes in gene in a population over a few generations. One of the examples is when insects have evolved resistance to pesticides. Microevolution only occurs when there's a level of animals not only individuals.