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The earths air is not made up of only oxygen. it is actually about 75% Nitrogen, and only about 12% oxygen. In fact, nitrogen is the most common element on earth. so every time you breathe, or eat or sweat, your body absorbs nitrogen. Also, you cannot really talk of Nitrogen having an 'origin', as it is constantly involved in a CYCLE. Check out this diagram of The Nitrogen Cycle. http://en.wikipedia.org/wiki/File:Nitrogen_Cycle.jpg

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15y ago

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