It is known that for each subsequent trophic level. transfers about 10% of the energy contained

It is known that for each subsequent trophic level. transfers about 10% of the energy contained in the body. Explain where the other 90% is spent

The body takes 10% of the previous trophic level, eating one or another organism from it. So we must understand what the food of organisms turns into. These 90% that remain go to support the life of the body. Food, namely an organism from the previous trophic level, is a source of energy, as well as a building material for a living organism. And this is exactly what 90% is spent on.