When an ATP molecule is broken off it’s used as the energy source i believe, whereas when it’s added back on energy is stored. it stands for adenosine tri phosphate, meaning it’s composed of three phosphates (that’s why one of them can break off)
Answer:
The animal gets energy from the food
“In the light-dependent reactions, energy absorbed by sunlight is stored by two types of energy-carrier molecules: ATP and NADPH. The energy that these molecules carry is stored in a bond that holds a single atom to the molecule. For ATP, it is a phosphate atom, and for NADPH, it is a hydrogen atom.”