Early investigators thought the oxygen produced by photosynthetic plants came from carbon dioxide.In fact,it comes from:

Name: Early investigators thought the oxygen produced by photosynthetic plants came from carbon dioxide.In fact,it comes from:
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Oxygen produced by photosynthetic plants comes from water, which is split during the light reaction of photosynthesis. The electrons from water are used to generate ATP and NADPH, which are then used in the dark reaction to fix carbon dioxide into glucose.

Early Investigators Thought the Oxygen Produced by Photosynthetic Plants Came