Which statement best describes the roles of photosynthesis and cellular respiration in the carbon cycle? A. Cellular respiration and photosynthesis both add carbon to the atmosphere. B. Cellular respiration and photosynthesis both remove carbon to the atmosphere. -C. Cellular respiration adds carbon to the atmosphere and photosynthesis removes carbon from the atmosphere. (D. Photosynthesis adds carbon to the atmosphere and cellular respiration removes carbon from the atmosphere.