Fact 1: Biomass is the total mass of organisms at a trophic level. Fact 2: Each of the steps in the food chain is a trophic level . Given the two facts above, biomass is the total mass of organisms at a step in the what?

Select from the following.
[i] Energy
[ii] Plants growth
[iii] food chain
[iv] agriculture
[v] Animal survival
[vi] Energy.
[vii] energy usage
[viii] kinetic energy
Answer:
[iii]