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character: Nitrogen-fixing Bacteria
topic: Contribution to Nitrogen Cycle
grade: 9
subject: Biology
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character: Azotobacter
topic: Role in Nitrogen Fixation
grade: 9
subject: Biology
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character: Rhizobium
topic: Symbiotic Relationship with Legumes
grade: 9
subject: Biology
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character: Nitrifying Bacteria
topic: Conversion of Ammonia to Nitrate
grade: 9
subject: Biology
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