When they were first sold, aerosol insecticides were highly effective in killing mosquitoes. Now, several decades later, a much smaller proportion of these insects die when sprayed. The reason fewer insects die when they are sprayed is that __________.
a. larger portions of the mosquito populations today are descendants of individuals that were insecticide-resistant
b. mosquitoes that survive spraying develop an immunity to the insecticide
c. mosquitoes develop a physiological tolerance during their lives to repeated, gradual exposure to insecticide
d. the insecticide causes mutations in genes associated with insecticide resistance
e. None of the listed responses are correct.
Answer: a. larger portions of the mosquito populations today are descendants of individuals that were insecticide-resistant
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