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Gr 4–8—Life on Earth has existed for nearly 3.5 billion years, but 99.9 percent of the species that have ever lived have gone extinct. Six of these living fossils are described in engaging, easy-to-read, and beautifully illustrated chapters. These living fossils include horseshoe crabs, which climb ashore from their deep-sea habitat to lay thousands of eg...Log In or Sign Up to Read More