Biomass is the mass of living material in plants and animals.
A pyramid of biomass represents the mass of the organisms at each stage in a food chain. It may be more accurate than a pyramid of numbers. For example, one bush may have many insects feeding on it but the mass of the bush is far greater than the mass of the insects.
Energy losses-Not all the food eaten can be digested, so energy is lost in faeces (waste materials). Some of the energy is used for respiration, which releases energy for living processes. This includes movement, so the more something moves the more energy it uses and the less is available for growth. In animals that need to keep a constant temperature, energy from the previous stage of the food chain is used simply to keep the animal at the correct temperature (e.g. 37°C in humans).
Energy is never really "lost". What it means here is that all of the energy in one stage of the food chain does not result in the growth of organisms in the next stage.
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