character: Dr. Emily Waters
topic: Ecologist specializing in aquatic ecosystems
subject: Science
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character: Professor John Rivers
topic: Role of nutrients in freshwater habitats
subject: Science
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character: Dr. Lisa Green
topic: Impact of nutrient runoff on aquatic biodiversity
subject: Science
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character: Mr. Sam Ocean
topic: Interactions between phytoplankton and nutrient levels
subject: Science
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