How is energy lost in a food web and what are the mechanisms that contribute to this loss?

Energy is lost in a food web through various mechanisms such as heat loss, incomplete digestion, and metabolic processes. When organisms consume food, only a portion of the energy is transferred to the next trophic level, with the rest being lost as heat during metabolic processes. Additionally, energy is lost through waste production and respiration, further reducing the overall energy available in the food web.