character: Dr. John Smith
topic: How the Respiratory System Works
grade: 9
subject: Science
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character: Ms. Emily Johnson
topic: Gas Exchange in the Lungs
grade: 9
subject: Science
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character: Mr. Robert Brown
topic: Diseases of the Respiratory System
grade: 9
subject: Science
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character: Dr. Sarah Lee
topic: The Role of the Diaphragm in Breathing
grade: 9
subject: Science
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