character: Professor Mark Thompson
topic: Impact of pH Levels on Freshwater Fish
grade: 12
subject: Chemistry
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character: Dr. Lisa Carter
topic: Effects of Acid Rain on Aquatic Ecosystems
grade: 12
subject: Chemistry
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character: Mr. David Jenkins
topic: Water Quality Analysis in Freshwater Habitats
grade: 12
subject: Chemistry
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character: Ms. Sarah Johnson
topic: Role of Nutrient Levels in Freshwater Fish Health
grade: 12
subject: Chemistry
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