character: Mr. Tom Anderson
topic: The Nutrient Cycle in Freshwater Ecosystems
grade: 12
subject: Biology
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character: Dr. Emily Carter
topic: Freshwater Food Web Dynamics
grade: 12
subject: Biology
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character: Ms. Sarah Lee
topic: Impact of Pollution on Freshwater Nutrient Cycles
grade: 12
subject: Biology
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character: Professor John Smith
topic: Ecosystem Services in Freshwater Environments
grade: 12
subject: Biology
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