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character: Aquatic Ecosystems
topic: Effects of Organism Diversity on River Health
grade: 9
subject: Biology
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character: Decomposers
topic: Role in Aquatic Ecosystems
grade: 9
subject: Biology
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character: Invasive Species
topic: Impact on River Biodiversity
grade: 9
subject: Biology
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character: Phytoplankton
topic: Importance in Aquatic Food Chains
grade: 9
subject: Biology
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