Final answer:
Pesticides function by targeting and controlling pests that can harm crops or impact human health, utilizing various chemical compositions and actions.
Explanation:
Pesticides work by deterring, incapacitating, or killing pests that damage crops or pose health risks. They can target a variety of pests including insects, plant pathogens, weeds, and more. Different classes of pesticides exist such as insecticides, herbicides, and fungicides, each with specific chemical compositions and actions.
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