how are photosynthesis and cellular respiration related

Answer:
are related in the opposite way
Explanation:
In photosynthesis carbon dioxide is fixed and oxygen is released. Sunlight is important and necessary for photosynthesis.
While in the cellular respiration, oxygen is consumed, and carbon dioxide is released, releasing energy. Cellular respiration is independent of the presence or absence of light.
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I hope it is useful. Regards. María