Nitrogen is used in the nitrogen cycle to help plants grow.
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http://en.wikipedia.org/wiki/Nitrogen#Applications
Everyone uses nitrogen. It is essential for life.
The Nitrogen that is used to make Ammonia (NH4) is extracted from the air.
Nitrogen is an essential part of proteins.
Plant growth.
the answer is suck off
Bacteria
Nitrogen is a pure gas and so is the important one.
The nitrogen cycle uses bacteria to fix atmospheric nitrogen gas into a form that plants can use, a process known as nitrogen fixation. This bacteria, such as Rhizobium and Azotobacter, convert nitrogen gas into ammonia through biological processes.
Oxygen keeps animals alive, Nitrogen is not much use.
without nitrogen our bodys would over oxygenate (get to much oxygen). nitrogen is important for plants, after all they breath in nitrogen and breath out oxygen.