http://en.wikipedia.org/wiki/Nitrogen#Applications
Nitrogen is used in the nitrogen cycle to help plants grow.
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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
Oxygen keeps animals alive, Nitrogen is not much use.
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.
it is used by plants and animals
Nitrogen, phosphorus, and arsenic are all elements found in group 15 of the periodic table. They are all nonmetals and have various industrial uses. Nitrogen and phosphorus are essential elements for life, while arsenic is toxic.