Body Parts: Double-Jointedness, Hitchhiker’s Thumb, and More

Body Parts: Double-Jointedness, Hitchhiker’s Thumb, and More

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Can you stretch your thumb back to your arm? Is your pinkie straight or slightly bent? What determines the way your joints bend—or don't bend? Read this book to find out about how your genes affect your physical features.
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Ages: 8-10
Read time: 15-30 mins
AR LEVEL: 3.0
LEXILE©: 510L
Ages: 8-10
Read time: 15-30 mins

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