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	58   Directed Inquiry Explore How can you observe your pulse? 60   How to Read Science Sequence 61     You Are There! 62      Lesson 1 What is the circulatory system? 63      Lesson 2 What is the respiratory system? 70      Lesson 3 What are the digestive and urinary systems? 74   Guided Inquiry Investigate What is your lung capacity? 80    Average Heart Rates 82     Chapter 3 Review and Test Prep 84    The Human Body in Space 86     Charles Drewe 88