"Clear and inviting nonfiction prose, vetted by scientists--together with lively illustrations and a time line--narrate how life on Earth emerged "out of the blue." Learn how and why creatures began to emerge from the deep--from the Cambrian Explosion to crustaceans, mollusks to fishes, giant reptiles to the rise of mammals--and how they compare to the animals we know today, in a lively and accessible outing into the prehistoric past that boils a complex subject down to its lyrical essence."--Publisher's description.
