Teach your 1st graders the basic principles of mammals, fish, birds, insects, seasons and matter, space, machines, and more. Full-color, write-in pages show large photographs and highlighted key terms that showcase concepts and systems; students make their own booklets by answering questions and completing exercises that are integrated into the explanatory text. A review and a journal entry completes each chapter. Four units (Life Science, Physical Science, Earth & Space Science, and the Human Body) with thirteen chapters included. 202 perforated pages, softcover; this is a consumable, non-reproducible text. 2nd Edition. Level 1.