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character: Ammonia
topic: Precursor to Nitrites in Nitrogen Cycle
grade: 9
subject: Science
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character: Nitrite
topic: Role of Nitrites in Nitrogen Cycle
grade: 9
subject: Science
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character: Nitrification
topic: Processes Involving Ammonia and Nitrite
grade: 9
subject: Science
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character: Nitrogen Transformation
topic: Nitrogen Cycle Overview
grade: 9
subject: Science
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