character: Nutrient Cycles in Ecosystems
topic: Overview of Nutrient Cycles
grade: 9
subject: Biology
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character: Carbon Cycle
topic: Importance of Carbon in Ecosystems
grade: 9
subject: Biology
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character: Nitrogen Cycle
topic: Role of Nitrogen in Plant Growth
grade: 9
subject: Biology
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character: Phosphorus Cycle
topic: Impact of Phosphorus on Aquatic Systems
grade: 9
subject: Biology
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