Concept:Carbon (IV) oxide is removed from the atmosphere when green plants use it to make food.Explanation:Photosynthesis takes in atmospheric CO2 and converts it into glucose and oxygen.This process reduces the amount of carbon (IV) oxide in the air.Burning fuels releases CO2 into the atmosphere.Putrefaction also releases CO2 during decomposition.Respiration in plants releases CO2 as a waste product.Therefore, the only listed process that removes CO2 is photosynthesis.Answer:C. Photosynthesis