Summary:
- 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.