The sunlight, water, carbon dioxide, chlorophyll, feed photosynthesis and it go to stomata and gives oxygen
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Mansi Shirbhate answered this
In nature, free oxygen is produced by the light-driven splitting of water during oxygenic photosynthesis. According to some estimates, green algae and cyanobacteria in marine environments provide about 70% of the free oxygen produced on Earth and the rest is produced by terrestrial plants.
