You are presented with the question "Biomass is the total mass of what at a trophic level?" and the following answer choices: 
- Plants growth
 - peachleaf willow
 - Conifers
 - animals
 - living things
 - Most plants
 - all matter
 - insects

Now knowing that biomass is the total mass of organisms at a trophic level and an organism is a living thing, choose the best answer.


 

     living things    