character: Nitrogen-fixing bacteria
topic: Role in agriculture
grade: 9
subject: Science
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character: Rhizobium
topic: Symbiotic relationships in legumes
grade: 9
subject: Science
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character: Azotobacter
topic: Free-living nitrogen-fixing bacteria
grade: 9
subject: Science
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character: Nitrifying bacteria
topic: Nutrient cycling in soil
grade: 9
subject: Science
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