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What is the origin of oxygen? Where did it come from?

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What is the origin of oxygen? Where did it come from?

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  1. It's a element!


  2. oxygen is a gas, and has been around since the beginning of the universe.  To answer where oxygen comes from you need to ask where did the universe come from.

  3. Earth's oxygen came from early organisms who evolved to perform Photosynthesis. Just as today, early organisms separated the carbon and oxygen of CO2, and released the O2 into the atmosphere.

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