Final answer:
Cellular respiration is the energy pathway used by all living organisms. It converts glucose and oxygen into carbon dioxide, water, and ATP. The process consists of four main stages.
Step-by-step explanation:
Cellular respiration is the energy pathway used by all living organisms. It is the process by which cells convert glucose and oxygen into carbon dioxide, water, and energy in the form of ATP. Cellular respiration consists of four main stages: glycolysis, pyruvate oxidation, the Krebs cycle, and oxidative phosphorylation.