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

Fact 2: An organism is a living thing.

Given the two facts above, answer the question "Biomass is the total mass of what at a trophic level?" with the following options: 
- Plants growth
 - peachleaf willow
 - Conifers
 - animals
 - living things
 - Most plants
 - all matter
 - insects


 

     living things    