Cellular respiration converts the reactants' oxygen and glucose into carbon dioxide, water, and energy. the reverse reaction of photosynthesis converts reactants of carbon dioxide and water into oxygen and glucose. these two reactions are part of which biogeochemical cycle?

water cycle
carbon cycle
phosphorus cycle
nitrogen cycle

Carbon cycle

Explanation:

All organic compounds are made of carbon. The source of the carbon in the living matter is carbon dioxide  whcih is present in the atmospheric air or carbon dioxide dissolved in water. Green plants and algae (producers) use carbon dioxide to make food (carbohydrate) in the presence of sunlight and water in the process of photosynthesis. The prepared carbohydrate is used by the producers and excess food is stored as fats and polysaccharides which are eaten by consumers. Carbon dioxide goes back to the atmosphere through cellular respiration.

i think the answer would be d

correct answer is a. and d.