The human body is very similar to a machine, with separate mechanisms that work together to keep us healthy. In this book, learn about the different systems, such as the respiratory and the circulatory system, among others, that keep our body functioning normally. Also read little Teri s questions as well the Green Genius s answers about the way the human body works. Books in this series: Science in our Environment: Animal Kingdom Science in our Environment: Communications Science in our Environment: Galaxies, Stars, Planets Science in our Environment: Human Body Science in our Environment: Light, Sound, Energy Science in our Environment: Plant Kingdom