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1. Five hundred cockroaches of one species were sprayed with a new insecticide. Twenty-four hours
later nearly all the cockroaches were dead. A few, however, survived. This outcome illustrates which one
of Darwin's key ideas about natural selection and variation?
A. All living things come from preexisting living things
B. Animals adapt to new environments.
C. There is variation among individuals within a species.
D. New species develop from survivors.
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1. Five hundred cockroaches of one species were sprayed with a new insecticide. Twenty-four hours
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