Difference between aerobic respiration and anaerobic respiration

Aerobic respiration uses oxygen to break down glucose, producing a large amount of ATP (energy). It occurs in the mitochondria and involves glycolysis, the Krebs cycle, and the electron transport chain. The byproducts are carbon dioxide and water.

Anaerobic respiration occurs in the absence of oxygen. It also starts with glycolysis, but then proceeds to fermentation, producing a much smaller amount of ATP. The byproducts vary depending on the organism, but can include lactic acid (in animals) or ethanol and carbon dioxide (in yeast).