A. CO₂
- Cellular respiration is the process by which organisms use oxygen to break down food molecules to get chemical energy for cell functions.
- The energy released is captured in molecules of adenosine triphosphate, or ATP, which then supply it to fuel other cellular processes.
- The process begins in the cytoplasm and is completed in a mitochondrion. Cellular respiration occurs in three stages: glycolysis, the Krebs cycle, and electron transport.
Oxygen and glucose are both reactants in the process of cellular respiration. The main product of cellular respiration is ATP; waste products include carbon dioxide and water.
Therefore, option A is correct.
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