Which statement best describes how the evolution of pesticide resistance occurs in a population of insects?
a. individual members of the population slowly adapt to the presence of the chemical by striving to meet the new challenge.
b. all insects exposed to the insecticide begin to use a formerly silent gene to make a new enzyme that breaks down the insecticide molecules.
c. insects observe the behavior of other insects that survive pesticide application, and adjust their own behaviors to copy those of the survivors.
d. a number of genetically resistant pesticide survivors reproduce. the next generation of insects contains more genes from the survivors than it does from susceptible individuals.