Q. Planarians, flukes, tapeworms, proglottid, scolex, trichinella,redula, mantle, muscular foot, segmentation, earthworms, polychaetes, leeches, Hirudo, medicinalis, exoskeleton, cuticle, molting, head, thorax, abdomen, incomplete and complete metamorhosis, water vascular system, tube feet What are the basic chordate characteristics? How did the first amphibians arrive on land Salamander, metamorphosis, frog, and aquatic adaptations, terrestrial adaptations what are the major adaptations of amphibians, birds, reptiles and mammals? What are the dissimilar types of animals in these groups? Anmiotic egg,plastron, carapace, snake, lizard, turtle, feathers How did jaws evolve?