15.E: Diverstity of Animals (Exercises) Last updated Save as PDF Page ID8093 Contributed by OpenStaxConcepts of Biology at OpenStax CNX 15.1: Features of the Animal Kingdom 15.2: Sponges and Cnidarians 15.3: Flatworms, Nematodes, and Arthropods 15.4: Mollusks and Annelids 15.5: Echinoderms and Chordates 15.6: Vertebrates