You are presented with the question "Biomass is the total mass of organisms on a level such as what" and the following answer choices: 
- Energy
 - trees
 - Energy.
 - bottom of feet
 - herbivores
 - kinetic energy
 - animals
 - energy usage

Now knowing that biomass is the total mass of organisms at a trophic level and herbivores are the second trophic level and graze on plants, choose the best answer.


 

     herbivores    