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character: Soil Microbes
topic: Role of Microbes in Nitrogen Cycle
grade: 9
subject: Science
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character: Nitrogen-Fixing Bacteria
topic: Conversion of Atmospheric Nitrogen to Ammonia
grade: 9
subject: Science
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character: Nitrifying Bacteria
topic: Oxidation of Ammonia to Nitrates
grade: 9
subject: Science
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character: Denitrifying Bacteria
topic: Reduction of Nitrates back to Atmospheric Nitrogen
grade: 9
subject: Science
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