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character: Nitrifying Bacteria
topic: Nitrification Process
grade: 9
subject: Science
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character: Ammonia
topic: Role in Nitrogen Cycle
grade: 9
subject: Science
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character: Nitrites
topic: Intermediate in Nitrification
grade: 9
subject: Science
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character: Nitrates
topic: End Product of Nitrification
grade: 9
subject: Science
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