Define the three primary energy systems? What is the purpose of each? Where do they take place? What processes &/or cycles is aerobic metabolism composed of?

The Three Primary Energy Systems

METABOLISM/ENERGY SYSTEM ASSIGNMENT
1. Define the three primary energy systems?
2. What is the purpose of each?
3. Where do they take place?
4. What processes &/or cycles is aerobic metabolism composed of?
5. How do they (processes, reactions, cycles, etc) work?
6. How much ATP is produced aerobically from each process/cycle/substrate?
7. Explain how energy systems impacts exercise and athletics?