3. DDT is an insecticide used in farming.
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The mechanism by which DDT acts is to disturb the function of nerves in the insect. Nerves in both insects and humans work by allowing an electric current to move down them. ... Naturally, at high doses DDT will cause toxic effects in humans, due to effects on nerve function, but these effects are reversible.
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Farmers used DDT on a variety of food crops in the United States and worldwide. DDT was also used in buildings for pest control. The reason why DDT was so widely used was because it is effective, relatively inexpensive to manufacture, and lasts a long time in the environment.
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