Asubstance that kills insects that feed on crops but can bioaccumulate up the food chain is known as a:

c

explanation:

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

check for the pregnancy rating of drug. if its class c or d see if other alternatives