Answer:
Carbon cycle
Step-by-step explanation:
The carbon cycle shows how carbon existing in different compounds can be recycled between living organisms and the environment.
Glucose is an organic compound and all organic compounds contain Carbon. Carbon enters the atmosphere as Carbondioxide (CO2) from respiration, the CO2 is then used by plants to produce their food (carbohydrate) in a process called photosynthesis.
Animals (primary consumers) feed on plants passing the carbon compounds to other consumers along the food chain. CO2 is exhaled by these animals during respiration. These plants and animals eventually die, and their dead bodies are degraded by decomposers (microbes) returning the carbon in their body into the atmosphere as CO2 or they undergo combustion when used as fossil fuels.