For what reason is a significant portion of consumed energy lost between trophic levels?

Answer

The consuming organism uses it for metabolism, growth, and movement, dissipating it as heat.

A large amount of consumed energy is lost because the organism uses it for its own life functions, such as moving, growing, and maintaining body temperature, and this energy is ultimately dissipated as heat.

For what reason is a significant portion of consumed energy lost between trophic levels?
EcologyEcosystemenergyfood webtrophic level