character: Mr. Alan Richard
topic: Chemical Composition of Aquatic Habitats
grade: 12
subject: Chemistry
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character: Dr. Emily Carter
topic: Impact of pH on Aquatic Ecosystems
grade: 12
subject: Chemistry
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character: Professor John Smith
topic: Nutrient Cycling in Marine Environments
grade: 12
subject: Chemistry
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character: Ms. Sarah Johnson
topic: Water Quality Indicators and Analysis
grade: 12
subject: Chemistry
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