Richard Is an Avid Gardener Who Spends a Lot of Time

Richard is an avid gardener who spends a lot of time caring for the plants in his garden. To minimize damage from pests from his garden, Richard uses a pesticide spray. At first the spray is very effective and kills off most of the insects that he sees on his vegetable plants. However, after a few years of using the same pesticide, he notices that some insects are surviving and continuing to eat his plants. The ability of some of the insects to survive pesticide spraying would be considered

A) impossible.
B) a mutation.
C) an adaptation.
D) a gene.
E) a learned response.