character: Mark Johnson
topic: Understanding Infectious Diseases and Hygiene
grade: 9
subject: Science
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character: Dr. Sarah Thompson
topic: The Immune System and Disease Prevention
grade: 9
subject: Science
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character: Emily Carter
topic: Sanitation Practices in Everyday Life
grade: 9
subject: Science
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character: James Lee
topic: Pathogens: Types and Transmission Methods
grade: 9
subject: Science
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