Explain the interaction between anaerobic and aerobic energy systems as related to the fate of pyruvate

Explain the interaction between anaerobic and aerobic energy systems as related to the fate of pyruvate. As part of your answer, provide a detailed explanation (with references) as to what happens to pyruvate based on the presence or absence of
oxygen. Please also outline why oxygen is important in this process (ie. why it affects what happens to pyruvate) and where oxygen is used in ATP production.