Download or read book Sea Stars, Sea Urchins, and Their Relatives written by Beth Blaxland and published by Chelsea Clubhouse. This book was released on 2003 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Defines echinoderms, such as sand dollars and crown-of-thorns sea stars, and describes their physical characteristics, life cycles, habitats, sense, food, and means of self-defense.