Final answer:
Cellular respiration is the process in which cells break down glucose in the presence of oxygen and release carbon dioxide, water, and energy.
Step-by-step explanation:
Cellular respiration is the process in which cells break down glucose in the presence of oxygen and release carbon dioxide, water, and energy. The main reactants involved in cellular respiration are glucose and oxygen, which are broken down to produce carbon dioxide and water. This process occurs in the mitochondria and produces ATP as the main product. Cellular respiration is a vital metabolic process that all organisms perform to obtain energy for their cells.