Which statement best explains why some mosquitoes survived after the first spraying?
Select one:
a. No mosquitoes were adpated to resist the insecticide and the mosquito
population increased.
b. a natural variation existed within the mosquito population that allowed some
mosquitoes to survive and reproduce
c. The spraying of the insecticide represented a change in the environment to
which all adult mosquitoes were adapted.
d. All of the mosquitoes contained DNA unique to the species..