Which process is responsible for moving carbon from a producer/herbivore/carnivore/decomp oser back into the atmosphere?

question 3 options:

photosynthesis: where the carbon dioxide (co2) is turned into glucose (c6h12o6)

cellular respiration: where the glucose (c6h12o6) is turned into carbon dioxide (co2)

defecation: when an animal poops, carbon goes back into the soil

eating: when animals eat, they take in the carbon from the atmosphere