character: Biogeochemical Cycles
topic: Overview of Biogeochemical Cycles in Ecosystems
grade: 11
subject: Biology
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character: Carbon Cycle
topic: The Role of Carbon in Ecosystems
grade: 11
subject: Biology
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character: Nitrogen Cycle
topic: Understanding the Nitrogen Cycle and Its Importance
grade: 11
subject: Biology
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character: Water Cycle
topic: The Significance of the Water Cycle in Nature
grade: 11
subject: Biology
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