character: Overview of Biogeochemical Cycles
topic: Introduction to Major Nutrient Cycles
grade: 9
subject: Biology
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character: Carbon Cycle
topic: The Movement of Carbon through the Environment
grade: 9
subject: Biology
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character: Nitrogen Cycle
topic: Transformations and Importance of Nitrogen in Ecosystems
grade: 9
subject: Biology
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character: Phosphorus Cycle
topic: Role of Phosphorus in Biological Systems
grade: 9
subject: Biology
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