The cycle that describes the movement of carbon through living organisms is called the carbon cycle. This cycle involves processes such as photosynthesis, respiration, decomposition, and combustion. In photosynthesis, plants absorb carbon dioxide from the atmosphere, using it to produce glucose. Animals then consume these plants, and when they respire, they return carbon dioxide to the atmosphere. The carbon cycle is crucial for maintaining the balance of carbon in the environment and plays a significant role in climate change discussions.