Cellular respiration is an important part of the carbon cycle, helping to move carbon from living things back into the air. Animals get carbon by eating plants or other animals. Plants take in carbon dioxide (CO₂) from the air and use it to make food through photosynthesis. When animals eat this food, they take in carbon.
During cellular respiration, cells break down glucose (a type of sugar) using oxygen to produce energy, carbon dioxide, and water. The carbon dioxide is then released back into the atmosphere when animals breathe out. This CO₂ can be used again by plants, completing the carbon cycle. So, cellular respiration helps keep the carbon cycle going, allowing carbon to flow between the air, plants, and animals.