The key difference between photosynthesis and cellular respiration lies in the involvement of light.
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Photosynthesis involves light as it converts light energy into chemical energy, using carbon dioxide and water to produce glucose and oxygen.
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Cellular respiration, on the other hand, does not involve light; instead, it breaks down glucose in the presence of oxygen to produce energy, carbon dioxide, and water.
So, the correct response to the difference is: The process involves light.