Fact 1: Biomass is the total mass of organisms at a trophic level.

Fact 2: Trophic level refers to the organisms position in the food chain.

Given the two facts above, answer the question "what is biomass the total mass of?" with the following options: 
- remains of prehistoric life
 - nutrients
 - dead weight
 - organisms on the food chain
 - Microscopic organisms
 - h2o
 - sub-units of species
 - The number of individuals


 

    organisms on the food chain     