he continuous use of pesticides in great amounts, has two effects that are especially . First, pesticides kill the pests' natural enemies in the area. Second, it often accidentally engenders pests that are resistance to pesticides, since those that survive a particular pesticide will be highly resistant to it, and will be the ones left to breed.

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Explanation:

Pesticides are substances used to control pests such as, for example, harmful insects that attack crops. Pesticides are classified according to the target species (e.g., herbicides, insecticides, bactericides, etc) and the type of substance used as pesticide (e.g., biopesticide, chemical pesticide, etc). The use of pesticides in farming presents several concerns such as the emergence of resistance in target species, harmful effects on human health and environmental pollution. Moreover, pesticides may also present negative effects on non-target species, having a profound environmental impact in agroecosystems.

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explanation: