Final answer:
Polysaccharides such as starch and glycogen are the best long-term storage and release of energy (ATP).
Step-by-step explanation:
The long-term storage and release of energy in the form of ATP can best be found in polysaccharides such as starch and glycogen. Both starch and glycogen are composed of long chains of glucose molecules, and they serve as energy reserves in plants and animals, respectively.