Answer the following question given this paragraph: 

Pesticides were designed to kill bothersome insects. However, sometimes these pesticides will stop working. A pesticide that has worked in the past may no longer kill a particular type of insect. This is due to the development of resistance in the population of insects. The development of resistance to pesticides is one example of microevolution, a small change in a population.


Q: Resistance to pesticides in a population of insects is an example of what?

 Choices:

- macroevolution

- redistributions

- extinction

- microevolution

A:
microevolution
