Homework Help: ecology

Posted by nawal rahem on Wednesday, May 25, 2011 at 9:15pm.

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 populations, pyramids, predators and competitors

ecology - SraJMcGin, Wednesday, May 25, 2011 at 9:28pm
Sorry, but your question is not clear. What exactly do you need help on?

Sra

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