What law describes the loss of heat as Energy moves from one trophic level to the next?

The law that describes the loss of heat as energy moves from one trophic level to the next is the Second Law of Thermodynamics. This law states that energy transformations are not 100% efficient, leading to a decrease in usable energy as it moves through trophic levels. Typically, only about 10% of the energy from one level is transferred to the next, with the rest lost primarily as heat. This process explains the decreasing biomass and energy availability at higher trophic levels in an ecosystem.