Answer: Photosynthesis, Feeding, Respiration
Step-by-step explanation:
Photosynthesis: plants absorb carbon dioxide from the atmosphere and form it into sugar, starch and other organic compounds. This is the only process in the cycle that decreases the level of carbon dioxide in the atmosphere.
Feeding – moves carbon in the form of biological molecules along the food chain.
Respiration – when living organisms (plants, animals and decomposers) respire they release carbon dioxide into the atmosphere (this is a form of excretion).