A large population of cockroaches was sprayed with a newly developed, fast-acting insecticide. T...

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Insecticide (2008)
Duration: 2:26
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A large population of cockroaches was sprayed with a newly developed, fast-acting insecticide. The appearance o some cockroaches that are resistant to this insecticide supports the concept that
(a) species traits tend to remain constant
(b) insecticides cause mutations
(c) the environment does not change
(d) variation exists within a species
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