Audience: Students; Grades: 4-5; Subject: Science. (2004) Introduces invertebrates and their characteristics. Provides several examples of vertebrates to distinguish the common characteristic of invertebrate animals such as sponges or cnidarians. Films several examples of Porifera and Cnidarians later comparing them to platyhelminthes such as planaria; earthworms, nematodes, and annelids. Also distinguishes between radial symmetry and bilateral symmetry. Highlights the advanced nervous systems of mollusks and the body structure of arthropods and echinoderms. For the teacher's guide go to: https://drive.google.com/folderview?id=0B9ZT7PYcIjLfLTFYM0tEYkdyS3M&usp=sharing