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character: Nitrogen Cycle
topic: Overview of Nitrogen Cycle
grade: 9
subject: Biology
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character: Biological Nitrogen Fixation
topic: Importance of Nitrogen Fixation in Ecosystems
grade: 9
subject: Biology
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character: Nitrogen-fixing Bacteria
topic: Role of Nitrogen-fixing Bacteria in Agricultural Soil
grade: 9
subject: Biology
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character: Human Impact
topic: Effects of Human Activity on the Nitrogen Cycle
grade: 9
subject: Biology
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