Why Is Blood Red?

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What does the heart do? What are bones made of? Why do we yawn? Explore the intriguing answers to more than 200 questions about the human body. Covering amazing organs, stupendous senses, and the perplexing ways our bodies work, this book helps children get to grips with the gigantic topic that is human biology. Each page asks a new question that kids might have about the human body, before answering it, and features a quick quiz testing children's knowledge of what they have just read.