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

Fact 2: Herbivores are the second trophic level and graze on plants.

Given the two facts above, answer the question "Biomass is the total mass of organisms on a level such as what" with the following options: 
- Energy
 - trees
 - Energy.
 - bottom of feet
 - herbivores
 - kinetic energy
 - animals
 - energy usage


 

     herbivores    