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Plants. The largest single source of oxygen comes from the Taiga as far as I know.

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Q: What provides all the oxygen available to sustain life on earth?
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earth can sustain life because it has lots of oxygen and water


How does the earth sustain life?

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Why earth is called an unique planet?

earth is supposedly the only planet that can sustain life and has oxygen


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Which kingdom provides most of the earth's oxygen?

i do not know if you mean a specie or place. but i do know that plants provides the earth with oxygen. if you are looking for a place, then look at a place with the most plants. if you are looking for a specie, plants, provide the earth withoxygen (plants breathe in carbon dioxide and breathe out oxygen)