character: Ms. Sarah Lee
topic: Introduction to Pathogens
grade: 9
subject: Science
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character: Dr. John Smith
topic: The Immune System Basics
grade: 9
subject: Science
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character: Ms. Emily Chen
topic: Bacteria vs. Viruses
grade: 9
subject: Science
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character: Mr. Mike Johnson
topic: Disease Transmission Methods
grade: 9
subject: Science
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