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Chapter 5, Section 2 The Cycling of Materials (Pictures, Carbon Cycle…

- - - - Enters through photsynthesis
        
        Returns through respiration
  - - - Gets into the ocean from dissolved shells
  - - - Broken down by decomposers
- - - - the bacteria that do this is nitrogen fixing bacteria
      - these bacteria live in the roots of the plants called legumes
      - nitrogen build protein
      - the bacteria use sugar provided by legumes to produce nitrogen containing compounds such as nitrats
- - - - small amounts of phosphorus dissolve as phosphate, which moves into the soil
        
        many phosphate salts are not soluble in water, they sink to the bottom and accumulate assediment