Final answer:
In metabolism, energy that is not used is stored in the form of ATP. ATP is a chemical compound that cells use to store and release energy.
Step-by-step explanation:
In metabolism, energy that is not used is stored in the form of ATP. Every cell in the body uses adenosine triphosphate (ATP) to store and release energy. The cell stores energy in the synthesis (anabolism) of ATP and then breaks it down (catabolism) when the energy is needed.