Answer: A. Chemical energy can be stored more efficiently as glucose than it can be as ATP.
Chemical energy is formed or produced during the course of a chemical reaction or process. Glucose is the body’s way of storing chemical energy, and this glucose is stable and is used for all the metabolic processes that take place in the body, whereas ATP is more easily broken down.
When ATP is converted to ADP, chemical energy is released, not stored. ADP cannot be broken down into ATP because ATP is more complex than ADP. Also, ADP is not the only way that chemical energy is stored (ATP and glucose are other ways).