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

Fact 2: Each stage is a trophic level.

Given the two facts above, answer the question "The total mass of organisms in an environmental stage is called what?" with the following options: 
- food pyramid
 - extinction
 - ecological pyramid
 - food chain
 - vegetation
 - food
 - ligt
 - biomass


 

        biomass 