question: Which statement best describes the roles of photosynthesis and respiration in the carbon cycle?
choices.text: Respiration and photosynthesis both add carbon to the atmosphere. Respiration and photosynthesis both remove carbon from the atmosphere. Respiration adds carbon to the atmosphere, while photosynthesis removes carbon from the atmosphere. Photosynthesis adds carbon to the atmosphere, while respiration removes carbon from the atmosphere.
choices.label: A B C D