Earth is home to billions of life-forms, and scientists discover new species all the time. How do we keep track of all these living things? This immersive book gives readers a firsthand look at evolution and classification. They’ll learn about the scientific method through Ask, Test, Observe, and Measure boxes that guide them through each experiment. What’s Next? sections encourage readers to continue exploring each essential concept. As they complete each project, they’ll develop Next Generation Science Standards skills, such as how to ask testable questions. Accessible, fun, and full of amazing photographs, this engaging look at evolution and classification will be an important tool in any science curriculum.