character: Dr. Smith
topic: Effects of pH levels on fish populations
grade: 10
subject: Biology
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character: Professor Lee
topic: Impact of water quality on aquatic ecosystems
grade: 10
subject: Biology
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character: Ms. Johnson
topic: Acid rain and its effects on freshwater fish
grade: 10
subject: Biology
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character: Mr. Thompson
topic: The role of dissolved oxygen in fish survival
grade: 10
subject: Biology
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