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Photosynthesis can be divided into two stagesâthe light dependent reaction and the light independent (or dark) reactions. During the light reactions, an electron is stripped from a water molecule freeing the oxygen and hydrogen atoms. The free oxygen atom combines with another free oxygen atom to produce oxygen gas which is then released.
It's not CO2! That's what was originally thought, but in the 1930's, molecules of oxygen-18 were traced through photosynthesis, and it was found that the oxygen released a s a product actually came completely from a split H2O molecule (which also provides the electrons for the light reactions).