What purpose is served by the nitrogen in the air ?

Nitrogen is essential to all forms of life, being found in the tissues of animals and plants. I t is invisible and
has no taste, or smell. I t will not burn, and things do not burn in it. In the air it dilutes the oxygen in the same
way that Water dilutes spirits. In an atmosphere of undiluted oxygen animals would live too rapidly.
Nitrogen is also elaborated by certain plants, from nitrogenous compounds in the soil, and is stored in their
tissues as a food.

 

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