Concept:Photosynthesis is the process that removes carbon dioxide from the air.Explanation:During photosynthesis, green plants take in carbon dioxide from the atmosphere.They use this carbon dioxide, together with water and sunlight, to manufacture their food (glucose).In this way, carbon is removed from the air and stored in plant tissues.Combustion, respiration, and putrefaction all release carbon dioxide into the air, not remove it.Answer:D. photosynthesis