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nitrogen

Pronunciation:  nI-truh-jin
  
Definition :a colorless, odorless gas that makes up approximately 78 percent of earth's atmosphere
  
Facts: Nitrogen is a necessary element for all living organisms. Most organisms cannot use the nitrogen in the atmosphere--nitrogen has to be "fixed" (changed into another form).

Nitrogen is found in the environment in the form of nitrates or nitrites.

  
  
  
References:Daily University Science News: "Research Peers into Nature's Way of Fixing Nitrogen"