Question

what term is used to describe an increased concentration of toxic chemicals as we move up the food chain?
biomagnification
biodegradation

Explanation:

Biomagnification refers to the increase in concentration of toxic chemicals as one moves up the food - chain. Organisms at higher trophic levels accumulate more of the toxins that were present in organisms they consumed. Biodegradation is the breakdown of organic matter by living organisms, which is not related to the increase in toxic chemical concentration in the food - chain.

Answer:

Biomagnification