Why does the energy level go down as you go up the energy pyramid?

The energy level decreases as you move up the energy pyramid because of the energy loss that occurs at each trophic level, primarily due to metabolic processes. When organisms consume energy, only about 10% is typically transferred to the next level, with the rest lost as heat, waste, or through respiration. This inefficiency limits the number of trophic levels in an ecosystem, resulting in fewer organisms at higher levels. Consequently, energy decreases as you ascend the pyramid.