• Nitrogen is one of the most important nutrients needed by plants.
  • Decomposers release nitrogen into the air from dead organisms and their wastes.
  • Nitrogen is fixed when it is changed into a form that organisms can use.
  • A dead zone is an area in a body of water where nothing grows because there is too little oxygen.
  • The lack of oxygen makes it impossible for other organisms to live in that zone.
  • The nitrogen cycle includes air, soil, and living things.
  • Use the resource below to answer the questions that follow.
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