character: Nitrogen-Fixing Bacteria
topic: Conversion of Atmospheric Nitrogen to Ammonia
grade: 9
subject: Science
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character: Rhizobium
topic: Symbiotic Relationship with Legumes
grade: 9
subject: Science
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character: Azotobacter
topic: Free-Living Nitrogen-Fixers in Soil
grade: 9
subject: Science
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character: Nitrifying Bacteria
topic: Role in Nitrogen Cycle: Conversion of Ammonia to Nitrates
grade: 9
subject: Science
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