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When they were first sold, aerosol insecticides were highly effective in killing flies and 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. the original spraying has caused a permanent mutation, giving the insects genetic resistance to the spray.
b. mosquitoes are deliberately adapting themselves to this man-made change in the environment
c. mosquitoes that survive spraying develop an immunity to the insecticided.
c. many mosquitoes today are descendants of mosquitoes with insecticide-resistant characteristicse.
d. none of the listed responses is correct.
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