Out of the Blue: How Animals Evolved from Prehistoric Seas

This nonfiction picture book traces life on Earth from early single-celled microbes in the ancient sea through changing forms of life across vast stretches of time. It describes evolutionary changes, including microbes becoming more complex organisms, and arrives at the Cenozoic Era, the Age of Mammals. Digitally rendered illustrations show creatures from different periods, while a colored band on each spread identifies the period and how long ago it occurred.