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Nitrogen is an element. It is a gas forming about 80% of the air. Nitrogen is almost inert but it is a vital component in the proteins that go to making up living things. Therefore there is a natural Nitrogen cycle in nature. Nitrogen is trapped by bacteria forming the root nodules of certain plants (legumes and clovers) and during lightening strikes and is released back into the air by the processes of organic decay. Thus yes, the Nitrogen needed by living things is renewable.

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16y ago

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