character: Professor John Rivers
topic: Role of nutrients in freshwater habitats
subject: Science
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character: Dr. Emily Waters
topic: Impact of nutrient pollution in aquatic ecosystems
subject: Science
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character: Dr. Sarah Greenfield
topic: Nutrient dynamics in lakes and rivers
subject: Science
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character: Professor Mark Thompson
topic: Eutrophication and its effects on freshwater biodiversity
subject: Science
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