character: Penny the Physiologist
topic: Muscle Contraction and Energy Sources
grade: 9
subject: Science
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character: Dr. Muscle
topic: Types of Muscle Tissue
grade: 9
subject: Science
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character: Eddie the Energetic
topic: ATP and Energy Production
grade: 9
subject: Science
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character: Sally the Scientist
topic: How Muscles Use Fuel
grade: 9
subject: Science
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