Chapter Outline (See related pages) 23.1 What Is an Animal? 23.2 The Evolution of Animals 23.3 Temperature Regulation 23.4 Body Plans Symmetry Embryonic Cell Layers Body Cavities Segmentation Skeletons 23.5 Marine Lifestyles Zooplankton Nekton Benthic Animals 23.6 Primitive Marine Animals Porifera—Sponges Cnidaria—Jellyfish, Corals, and Sea Anemones Ctenophora—Comb Jellies 23.7 Platyhelminthes—Flatworms 23.8 Nematoda—Roundworms 23.9 Annelida—Segmented Worms 23.10 Mollusca 23.11 Arthropoda 23.12 Echinodermata 23.13 Chordata 23.14 Adaptations to Terrestrial Life Terrestrial Arthropods Terrestrial Vertebrates OUTLOOKS 23.1: The Problem of Image HOW SCIENCE WORKS 23.1: Genes, Development, and Evolution HOW SCIENCE WORKS 23.2: Coelacanth Discoveries
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