character: Nitrogen Cycle
topic: Overview and Steps of the Nitrogen Cycle
grade: 9
subject: Science
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character: Decomposers
topic: Role of Decomposers in Nutrient Recycling
grade: 9
subject: Science
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character: Nitrogen Fixation
topic: Importance of Nitrogen Fixation in Ecosystems
grade: 9
subject: Science
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character: Ecological Impact
topic: Impact of Human Activities on the Nitrogen Cycle
grade: 9
subject: Science
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