How and where did life begin on Earth? What makes Earth capable of sustaining living creatures? This information-rich book takes readers billions of years into the past to understand the earliest life-forms on Earth. They’ll delve deeply into essential science topics such as geological time, evolution, and animal classification. Intricate illustrations and 3-D images transport readers to a time before humans walked the earth. Engaging fact boxes highlight fascinating information and encourage curiosity. Avid and developing readers alike will be transfixed by the marvels of our planet’s earliest life-forms, making this book a valuable addition to any library and classroom.