Organisms used as ecological pesticides

Insecticides such as DDT, chlordane, and dieldrin don't break down easily, and they are still found in soil, plants, and animals. Persistent pesticides may travel long distances in the air or water, or even in living organisms such as migrating birds or fish.

Explanation:

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Forever friend and helper,

Cammie :)

looks like the answer is     c     to me!