character: Mr. Biology
topic: Respiratory System and Gas Exchange Mechanisms
grade: 9
subject: Science
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character: Dr. Anatomy
topic: How Gases Move in the Lungs
grade: 9
subject: Science
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character: Ms. Science
topic: Differences between Oxygen and Carbon Dioxide Transport
grade: 9
subject: Science
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character: Professor Health
topic: The Importance of Gas Exchange for Cellular Respiration
grade: 9
subject: Science
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