February 23, 2017

Homework Help: Science - Biology

Posted by Rana on Monday, October 6, 2008 at 10:36pm.

After spraying crops with DDT for several years, farmers found that populations of insect pests rebounded. One reason was that the insects had developed resistance to the insecticide. Suggest another reason, based on what you know about populations, pyramids, predators, and competitors.

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