character: Ms. Johnson
topic: Impact of pollutants on aquatic life
grade: 11
subject: Chemistry
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character: Mr. Smith
topic: Effects of acid rain on freshwater ecosystems
grade: 11
subject: Chemistry
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character: Dr. Lee
topic: Bioaccumulation of heavy metals in marine species
grade: 11
subject: Chemistry
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character: Prof. Green
topic: Eutrophication and its effects on dissolved oxygen levels
grade: 11
subject: Chemistry
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