character: Ecosystem Engineers
topic: The Role of Ecosystem Engineers in Habitat Modification
grade: 9
subject: Biology
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character: Bacteria
topic: Bacteria's Role in Nutrient Cycling
grade: 9
subject: Biology
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character: Decomposers
topic: The Importance of Decomposers in Ecosystems
grade: 9
subject: Biology
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character: Nutrient Cycles
topic: Understanding Biogeochemical Cycles: Nitrogen and Carbon Cycles
grade: 9
subject: Biology
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