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character: Nitrogen Cycle Overview
topic: Understanding the Nitrogen Cycle and its stages
grade: 9
subject: Science
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character: Role of Ammonia in the Cycle
topic: How ammonia contributes to the nitrogen cycle
grade: 9
subject: Science
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character: Nitrogen Fixation
topic: Process and significance of nitrogen fixation in ecosystems
grade: 9
subject: Science
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character: Impact of Human Activities
topic: Effects of agriculture and industry on the nitrogen cycle
grade: 9
subject: Science
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