Aerobic respiration produces more usable chemical energy than fermentation because it involves __________. Formation of lactic acid. Complete oxidation of food. Partial oxidation of food. Evolution of CO2 and alcohol.

Aerobic respiration is the process that leads to the complete oxidation of organic substances in the presence of oxygen and releases CO2, water, and a large amount of energy in the form of high energy bonds of ATP. In the cells of all living organisms, cellular respiration begins with glycolysis. In this process, glucose undergoes partial oxidation to form two molecules of pyruvic acid. In the absence of oxygen, pyruvic acid is converted to CO2 and ethanol by fermentation. In some organisms, lactic acid is formed from pyruvic acid, e.g., muscles during exercise. In fermentation, less than 7% of the energy in glucose is released.