The total amount of living tissue within a given trophic level is called the select one: a. organic mass. b. trophic mass. c. energy mass. d. biomass.

Answer is D- biomass

Biomass indicates that how does the energy flow within tropic levels. It is the amount of energy that a tropic level has consumed. That can be shown in a biomass pyramid. Second tropic level gets the 10% percent of energy from the first tropic level's biomass. Hence from bottom to top levels of the food chain, the biomass decreases.

This is an example of Oxidation