character: Mr. Johnson
topic: Acidic vs. Basic Ecosystems: A Comparison
grade: 9
subject: Chemistry
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character: Ms. Smith
topic: Effects of pH on Aquatic Life
grade: 9
subject: Chemistry
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character: Dr. Lee
topic: Biomes and Their Soil pH Levels
grade: 9
subject: Chemistry
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character: Mr. Thompson
topic: Acid Rain and Its Impact on Ecosystems
grade: 9
subject: Chemistry
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