Animal evolution is a complex subject, but in this title young readers will encounter easy-to-understand explanations on how fish went from finless blobs to the glow-in-the-dark anglerfish. Ancient creatures, transition animals, and modern-day fish swim through pages of colorful images and QR codes throughout the book. DiscoverRoo is an imprint of Pop!, a division of ABDO. Aligned to Common Core standards & correlated to state standards.