Question

what are pesticides?​

Answer 1

Pesticides are substances that are meant to control pests. The term pesticide includes all of the following: herbicide, insecticides nematicide, molluscicide, piscicide, avicide, rodenticide, bactericide, insect repellent, animal repellent, antimicrobial, and fungicide. 

Answer 2

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Pesticides are chemicals used to control weeds in insects fungi and diseases of plants.