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Sixth Grade (Grade 6) Biogeochemical Cycles Questions

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Grade 6 Biogeochemical Cycles
Grade 6 Biogeochemical Cycles
Grade 6 Biogeochemical Cycles
Which of the following is necessary for aquatic (water) life to survive?
  1. dissolved oxygen
  2. nitrates
  3. alkalinity
  4. point-source pollution
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