character: Nitrogen Cycle Overview
topic: Understanding the Nitrogen Cycle
grade: 9
subject: Science
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character: Nitrogen Fixation
topic: The Role of Bacteria in the Nitrogen Cycle
grade: 9
subject: Science
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character: Nitrification
topic: The Conversion of Ammonia to Nitrates
grade: 9
subject: Science
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character: Denitrification
topic: Returning Nitrogen to the Atmosphere
grade: 9
subject: Science
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