" ??? ??? ??? detritivore organism that feeds on plant and animal remains and other dead matter ??? ??? ??? decomposer An organism that breaks down wastes and dead organisms ??? ??? ??? trophic level Each step in a food chain or food web ??? ??? ??? food web A diagram that shows the feeding relationships between organisms in an ecosystem. ??? ??? ??? biomass A measure of the total dry mass of organ" . . . . .