Question

Where do nitrogen come from?

Answer 1

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Nitrogen makes up 78 per cent of the air we breathe, and it's thought that most of it was initially trapped in the chunks of primordial rubble that formed the Earth. ... Nitrogen can only be used by living organisms after it has been 'fixed' into more reactive compounds such as ammonia or oxides of nitrogen.

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Answer 2

It is already present in the atmospere bisides it is produces by nitrifying bacteria

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