character: Ms. Green
topic: How dissolved oxygen levels affect fish populations
grade: 11
subject: Chemistry
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character: Mr. Thompson
topic: The role of water temperature in fish habitat
grade: 11
subject: Chemistry
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character: Dr. Martinez
topic: Effects of pollution on aquatic ecosystems
grade: 11
subject: Chemistry
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character: Ms. Liu
topic: Biochemical Oxygen Demand and its impact on fish
grade: 11
subject: Chemistry
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