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The major process is photosynthesis, where water (H2O) and carbon dioxide (CO2) are converted into glucose and oxygen (O2), where the oxygen is released.

There are much more processes that involve the release of oxygen, such as the breaking up of ozone (O3) in the addition Nitrogen makes an environment that is unreactive to oxygen and supports molecular oxygen in an inert suspension taking it away from reactants Untill the cushioning effect of Nitrogen is overcome,that is how oxygen gets in the air.

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