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character: Nitrogen Cycle Overview
topic: The Nitrogen Cycle and its Importance in Ecosystems
grade: 9
subject: Biology
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character: Roles of Bacteria in Nitrogen Cycle
topic: Nitrogen-Fixing and Nitrifying Bacteria
grade: 9
subject: Biology
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character: Nitrogen's Role in Plant Growth
topic: Essential Nutrients and Nitrogen's Contribution to Ecosystems
grade: 9
subject: Biology
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character: Human Impact on Nitrogen Cycle
topic: Agriculture, Fertilizers, and Nitrogen Pollution
grade: 9
subject: Biology
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