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character: Dr. Green
topic: Chemical Indicators for Water Quality Testing
grade: 11
subject: Chemistry
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character: Mrs. Blue
topic: principles of water hardness and its impact on aquatic ecosystems
grade: 11
subject: Chemistry
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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: Ms. Red
topic: methods for testing dissolved oxygen levels in water
grade: 11
subject: Chemistry
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