This book was designed to help prepare students for NCLB science testing, and it can also serve as a general primer about classification. Humans best understand things when they can classify or categorize these things, and that includes every thing in our world. The classification of plants, animals, and other living things according to shared characteristics has created a breathtaking visual history of Life, whether living today or extinct from millions of years ago. Readers will learn that everything has its place in this historic landscape. A plethora of detailed images, photographs, diagrams, charts, and illustrations aid in a comprehensive understanding of classification.