Your Hardworking Heart and Spectacular Circulatory System

Your Hardworking Heart and Spectacular Circulatory System

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What is blood made of? Is it always red? How does blood reach your toes and travel back to the heart again? Your Hardworking Heart and Spectacular Circulatory System takes...
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Ages: 8-10
Read time: 15-30 mins
AR LEVEL: 6.0
LEXILE©: 950L
Ages: 8-10
Read time: 15-30 mins

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