In this program, learn all about invertebrates. What are the major characteristics of invertebrates? What are sponges, worms, mollusks, arthropods and echinoderms? How are they all uniquely different? The answers to all of these questions and many more are covered in depth with detailed graphics, diagrams and exciting video. On-screen, multiple-choice reviews at the end of each segment reinforce important concepts and make learning fun.