Organisms at each level of the food web use the energy for and some of the energy is released as heat energy.

Metabolism

Explanation:

The energy flow in food webs and chains begins at the producers and goes to the decomposers, who turn organic into inorganic matter, which will be reused by the producers.

Throughout them, only 10% of the energy is passed from one trophic level to another, as some is lost in the form of heat, and is largely used for vital metabolic functions or the reproduction of living things.

For these reasons, as energy moves from one organism to another, more food will be needed to meet the energy needs of consumers.

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