Read about the fascinating facts and figures related to your hard-working lungs and heart, as well as the massive system of veins and arteries that take blood and oxygen everywhere it needs to go.
This is Book 2 in the Your Body By Numbers Series. See all Your Body By Numbers books here.
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Melanie Waldron worked in children's publishing for many years before becoming a full-time author. She has written many non-fiction books for young people and specializes in science and geography topics.
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