character: Dr. Jane Wilson
topic: Biochemist studying nutrient cycles in aquatic ecosystems
grade: 9
subject: Chemistry
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character: Professor Mike Johnson
topic: Effects of pollutants on aquatic life and nutrient levels
grade: 9
subject: Chemistry
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character: Dr. Sarah Lee
topic: Role of vitamins and minerals in fish health
grade: 9
subject: Chemistry
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character: Dr. Tom Roberts
topic: Impact of fertilizers on freshwater organisms
grade: 9
subject: Chemistry
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