What conclusion can be drawn from the scientists observation?A.Insects have developed some

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What conclusion can be drawn from the scientists observation?

A.Insects have developed some sort of resistance to man-made poisons.

B.Insects have been eating plants for about 250 million years.

C.Farmers sometimes use a combination of two or three insecticides at once.

D.New insects mate with insects which survived from a certain kind of insecticide.

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