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character: Microorganisms
topic: Role of Microorganisms in the Nitrogen Cycle
grade: 9
subject: Biology
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character: Nitrogen-fixing Bacteria
topic: Contribution to Nitrogen Cycle
grade: 9
subject: Biology
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character: Nitrifying Bacteria
topic: Conversion of Ammonia to Nitrates
grade: 9
subject: Biology
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character: Denitrifying Bacteria
topic: Reduction of Nitrates to Atmospheric Nitrogen
grade: 9
subject: Biology
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