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uestion 1-1
re hundred cockroaches of one species were
rayed with a new insecticide. Twenty-four hours
er nearly all the cockroaches were dead. A few,
wever, survived. This outcome illustrates which
e of Darwin's key ideas about natural selection
d variation?
• All living things come from preexisting living things
• Animals adapt to new environments.
There is variation among individuals within a
)
species.
New species develop from survivors.
evious
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Answer
There is variation among individuals within a species.