character: Nitrogen-fixing bacteria
topic: Symbiosis with leguminous plants in soil enrichment
grade: 9
subject: Biology
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character: Leguminous plants
topic: Role in nitrogen fixation
grade: 9
subject: Biology
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character: Rhizobium
topic: Bacteria involved in symbiosis with legumes
grade: 9
subject: Biology
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character: Soil microbes
topic: Contribution to soil fertility and plant growth
grade: 9
subject: Biology
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