D. Germs is the correct answer.
We need more background information to help.
The cycle that is carried out during food chain and energy trophic level is the carbon cycle. The carbon cycle includes the giving off of the carbon dioxide of the organisms which is absorbed by plants through the stomata in aid for photosynthesis or food making. This also includes the energy loss from one organism to another until the eventual decomposition of the animal
Well because you weight is different form every thing else that goes on in your body.