21) How can you tell the trophic level of an organism based on the amount of protein, carbohydrate, and lipids they have in their diet?

Explanation:

an organism that can synthesize its own food by using light as a source of ... (proteins, lipids, nucleic acids, and complex carbohydrates) from their ... Heterotrophs function as consumers in the food chain; they obtain energy in the ... Ecosystems have characteristic amounts of biomass at each trophic level.

the answer is b)3/8x+1

not sure if this what   you'r looking for would be percent composition