Q: Biomass is the total mass of living things at each what?\nOptions:\n- (A) trophic level\n- (B) important habitats\n- (C) Energy.\n- (D) food and shelter\n- (E) Power plants\n- (F) animals\n- (G) body water\n- (H) heat energy
Let's think step by step below.

User
Biomass is the total mass of organisms at a trophic level. Most living things are called organisms. Biomass is the total mass of living things at a trophic level.
Thus, the answer is (A).
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