character: Soil Microorganisms
topic: Interactions in Nitrogen Transformation
grade: 9
subject: Science
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character: Nitrifying Bacteria
topic: Role in Nitrogen Cycle
grade: 9
subject: Science
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character: Denitrifying Bacteria
topic: Importance in Nitrogen Reduction
grade: 9
subject: Science
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character: Nitrogen-Fixing Bacteria
topic: Contribution to Soil Fertility
grade: 9
subject: Science
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