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character: Mr. Yellow
topic: The role of pH in determining water quality and organism health
grade: 11
subject: Chemistry
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character: Mr. Blue
topic: Effects of acid rain on aquatic ecosystems
grade: 11
subject: Chemistry
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character: Ms. Green
topic: How dissolved oxygen levels affect fish populations
grade: 11
subject: Chemistry
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character: Dr. White
topic: The importance of buffering capacity in maintaining water quality
grade: 11
subject: Chemistry
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