character: Nitrogenase
topic: Process of Nitrogen Fixation
grade: 9
subject: Biology
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character: Rhizobium
topic: Symbiotic Nitrogen Fixation
grade: 9
subject: Biology
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character: Azotobacter
topic: Free-Living Nitrogen Fixation
grade: 9
subject: Biology
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character: Legumes
topic: Plants Involved in Nitrogen Fixation
grade: 9
subject: Biology
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