A great deal of what is known about genetics and inheritance is thanks to what has been learned by studying microbes. Supporting the Next Generation Science Standards on heredity and inheritance of traits as well as the structures and processes of simple and complex organisms, this book introduces all of the various types of microbes found on Earth, and in and on human bodies: bacteria, archaea, and protists. Through engaging language that simplifies complicated science concepts into easily digestible pieces of information and detailed images and diagrams, students will learn about the discovery, evolutionary history, and roles of microbes in health, disease, and the functioning of our planet. Sidebars provide students with additional information to help them gain a deeper understanding of the diversity of life.