You are presented with the question "The total mass of organisms in an environmental stage is called what?" and the following answer choices: 
- food pyramid
 - extinction
 - ecological pyramid
 - food chain
 - vegetation
 - food
 - ligt
 - biomass

Now knowing that biomass is the total mass of organisms at a trophic level and each stage is a trophic level, choose the best answer.


 

        biomass 