question_answer

A gardener has a large garden and decides this year he will not let the pests get beyond control. At the earliest sign of insect pests, he applies an organic insecticide and continues to apply it every month throughout the growing season. The next year he decides not to use any insecticides, thinking that he must have eliminated the pests with the prior year's treat-ments. Unfortunately, the pests reappear in numbers greater than he has ever seen before, and his plants are destroyed. Investigating this phenomenon, he learns that he has just experienced a phenomenon known as

A)  resurgence                    

B)  pesticide resistance

C)  natural selection

D)  emergence