character: Dr. Lisa Green
topic: Exercise and Bone Density in Adolescents
grade: 9
subject: Science
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character: Dr. Sarah Mitchell
topic: Nutrition's Role in Adolescent Bone Health
grade: 9
subject: Science
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character: Coach John Smith
topic: Physical Activity Guidelines for Teens
grade: 9
subject: Science
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character: Dr. Emily Davis
topic: Impact of Weight-Bearing Exercise on Bone Strength
grade: 9
subject: Science
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