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character: Ammonia
topic: Role in Nitrogen Cycle
grade: 9
subject: Science
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character: Nitrogen
topic: Nitrogen Fixation Process
grade: 9
subject: Science
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character: Nitrifying Bacteria
topic: Conversion of Ammonia to Nitrates
grade: 9
subject: Science
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character: Denitrifying Bacteria
topic: Role in Returning Nitrogen to the Atmosphere
grade: 9
subject: Science
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