You are presented with the question "What is fourty percent of the total mass of organisms at a trophic level?" and the following answer choices: 
- worms
 - carbon
 - Energy
 - leaves
 - blood
 - fungi
 - Energy.
 - food

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


 

  carbon       