Answer:
At the top of the food web, energy is lost as heat through the process of metabolism. The energy that is contained within the food that an organism consumes is used to power the organism's life processes, such as movement, growth, and reproduction. Some of this energy is also used to maintain the organism's body temperature, and the rest is lost as heat. In this way, energy is passed from one organism to another as it moves up the food web, with each organism taking in energy from the organism below it and losing some of that energy as heat. At the top of the food web, there is a relatively small number of organisms, and therefore the amount of energy that is available to them is limited. As a result, top predators tend to have relatively low metabolic rates, which helps them to conserve energy.
