4. how does carbon go from a mammals body back into the air?

Answer:

Carbon in a mammal's body returns to the air mainly through the process of respiration and decomposition. During respiration, mammals take in oxygen and release carbon - dioxide (CO₂) into the air. When a mammal dies, its body is decomposed by decomposers such as bacteria and fungi. These decomposers break down the organic matter in the body, releasing carbon in the form of CO₂ back into the atmosphere.

Brief Explanations:

Respiration and decomposition are key processes. Respiration is a continuous process in living mammals, while decomposition occurs post - mortem. Both release carbon as CO₂.