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FOREWORD AND PREFACE TO THE 3RD EDITION
Diversity within and between species 7 Nomenclature
Darwin and natural selection 25 Gene pools ami speciation
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acoels adaptive zone adult algae amino acids ancestor animal diversity ANIMAL PHYLOCENY annelids appendages archetype arthropods bilaterally symmetrical biology biology's unfinished business birds BODY CAVITIES body wall cavities and segmentation cells cellular changes chordates ciliated cnidarians coelom complex Darwin dorsal embryo eohippus epidermis EUMETAZOAN evolution evolutionary evolved example exoskeleton external FEATURES OF ANIMAL fertilization Figure flagellated flatworms formation fossil record free-living functions gastrodermis gene pool genera genetic germ layers homologies ingest internal larva larval form layer MAJOR FEATURES medusa mesoderm metazoans mode molecules molluscs mouth MULTICELLULAR FORMS muscles mutational natural selection niches organ systems origin Paleozoic parasitic phyla phyletic phylogenetic phylogenetic studies phylogeny phylum planula polyp POOLS AND SPECIES populations present problem proteins protozoa pseudocoel Redrawn schizocoelous sequence similar SPECIES DIVERSIFICATION spiral cleavage sponges stage structure symmetry taxa taxon tion traits trochophore tube turbellarian unicellular variety vertebrates worms