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The Circulatory System: Why Does My Heart Beat? (Heinemann First Library)
The Circulatory System Why Does My Heart Beat - Heinemann First Library Author:Sue Barraclough Your body is amazing! There are parts you can see and parts under your skin that you can't see. These parts work together to keep you alive and help you to do incredible things. You can feel your heart beating in your chest. Have you ever wondered why it d