character: Dr. Sarah Johnson
topic: Role of Vitamin D in Bone Health
grade: 9
subject: Science
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character: Dr. Emily Carter
topic: Importance of Calcium for Healthy Bones
grade: 9
subject: Science
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character: Dr. Michael Smith
topic: How Nutrition Affects Bone Density
grade: 9
subject: Science
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character: Dr. Lisa Brown
topic: Effects of Sunlight on Vitamin D Production
grade: 9
subject: Science
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