21. Evolution
Introduction to Evolution and Natural Selection
Multiple Choice
Multiple ChoiceWhen 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
mosquitoes that survive spraying develop an immunity to the insecticide
B
mosquitoes are deliberately adapting themselves to this human-made change in the environment
C
the original spraying has caused a permanent mutation, giving the insects genetic resistance to the spray
D
None of the listed responses is correct.
E
many mosquitoes today are descendants of mosquitoes with insecticide-resistant characteristics
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