What two biotic process return the carbon back to the earth?

The two biotic processes that return carbon to the earth are respiration and decomposition. During respiration, organisms, including plants, animals, and microorganisms, convert organic carbon into carbon dioxide (CO2) while releasing energy. Decomposition involves the breakdown of dead organisms and organic matter by decomposers, such as bacteria and fungi, which also release CO2 and other carbon compounds back into the soil and atmosphere. Together, these processes play a crucial role in the carbon cycle, replenishing carbon in the ecosystem.