D: Some energy is lost as heat or not consumed by organisms at the next trophic level.
Explanation:
As you can see from the diagram, the energy in a food chain is passed in a unidirectional way, starting with producers, passing through consumers and ending between decomposers.
The amount of energy becomes smaller and smaller as the trophic level rises, as a result, the higher trophic levels have less energy. This is because the transfer of energy from the lowest to the highest trophic level causes a loss of energy in the form of heat, in addition, often the energy is not consumed by the organism of the next trophic.
