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The following evidence was gathered to support the idea that natural selection illustrates a direct relationship between species' environments and their physical traits. 1. Well-known instances are the many cases of insect resistance to pesticides, which are synthetic substances not present in the natural environment. When a new insecticide is first applied to control a pest, the results are encouraging because a small amount of the insecticide is sufficient to bring the pest organism under control. As time passes, however, the amount required to achieve a certain level of control must be i
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The following evidence was gathered to support the idea that natural selection illustrates a direct...
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