character: Nitrogen-Fixing Bacteria
topic: Role in converting atmospheric nitrogen to usable forms for plants
grade: 9
subject: Science
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character: Rhizobium
topic: Symbiotic relationship with leguminous plants to fix nitrogen
grade: 9
subject: Science
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character: Azotobacter
topic: Free-living bacteria that fix nitrogen in the soil
grade: 9
subject: Science
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character: Nitrifying Bacteria
topic: Convert ammonia to nitrates, aiding in nitrogen cycle
grade: 9
subject: Science
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