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

Fact 2: Fourty percent of biomass is carbon.

Given the two facts above, answer the question "What is fourty percent of the total mass of organisms at a trophic level?" with the following options: 
- worms
 - carbon
 - Energy
 - leaves
 - blood
 - fungi
 - Energy.
 - food


 

  carbon       