character: Soil Microorganisms
topic: Role in Nitrogen Fixation
grade: 9
subject: Science
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character: Rhizobia
topic: Symbiotic Nitrogen-Fixing Bacteria
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: Mycorrhizal Fungi
topic: Indirect Contribution to Nitrogen Availability
grade: 9
subject: Science
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