character: Nutrient Cycling
topic: Understanding the Role of Nutrients in Ecosystems
grade: 9
subject: Biology
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character: Lichens
topic: Symbiotic Relationships and Ecological Importance
grade: 9
subject: Biology
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character: Soil Formation
topic: Processes Involved in Soil Development and Composition
grade: 9
subject: Biology
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character: Biogeochemical Cycles
topic: How Nutrient Cycling Affects Ecosystem Health
grade: 9
subject: Biology
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