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January 25, 2015

Homework Help: biology

Posted by Anonymous on Tuesday, May 13, 2014 at 11:31am.

A farmer sprays insecticide on his crops and notices that the insect pest problem disappears. A year later he tries the same insecticide only to find that he did not achieve the same result. The insect population shows resistance to the insecticide. This is an example of ____ acting on a population to change its characteristics.

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