Download or read book Sea Stars, Sea Urchins and Their Relatives written by Beth Blaxland and published by . This book was released on 2002 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.