character: Ms. Johnson
topic: Bioaccumulation of toxins in marine species
grade: 11
subject: Chemistry
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character: Dr. Smith
topic: Effects of heavy metals on marine ecosystems
grade: 11
subject: Chemistry
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character: Mr. Thompson
topic: Chemical interactions in aquatic environments
grade: 11
subject: Chemistry
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character: Ms. Lee
topic: Trophic levels and pollutant transfer in marine food webs
grade: 11
subject: Chemistry
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