Extended Response

Farmers often try to limit the number of insects on crops by applying chemical insecticides to the crops. Sometimes, an insecticide that had previously been effective no longer affects certain types of insects.

Part A Why do farmers try to control insects?

Part B How can the effect of insecticides on certain insect populations change?

For a question about an illustration that has labels, read the labels carefully and then check that the answer you choose matches your interpretation of the labels.

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