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character: Nitrogen Fixation
topic: Process in the Nitrogen Cycle
grade: 9
subject: Biology
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character: Nitrification
topic: Transformation of ammonia into nitrates
grade: 9
subject: Biology
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character: Denitrification
topic: Conversion of nitrates back to nitrogen gas
grade: 9
subject: Biology
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character: Ammonification
topic: Decomposition of organic matter into ammonia
grade: 9
subject: Biology
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