character: Ecosystem Interactions
topic: How Nutrient Cycling Affects Ecosystems
grade: 9
subject: Biology
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character: Nutrient Cycling
topic: Importance of Decomposers in Ecosystems
grade: 9
subject: Biology
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character: Energy Flow
topic: Trophic Levels and Food Chains
grade: 9
subject: Biology
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character: Biogeochemical Cycles
topic: Carbon and Nitrogen Cycles in Ecosystems
grade: 9
subject: Biology
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