Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.
Explanation:
Oxygen does not enter the body except due to some diseases and loss of consciousness, and then the patient uses a ready-made ventilator
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