PART ONE<br>Introduction to Living Animals<br>1 Life: Biological Principles and the Science of Zoology<br>2 The Origin and Chemistry of Life <br>3 Cells as Units of Life <br>4 Cellular Metabolism <br>PART TWO<br>Continuity and Evolution of Animal Life<br>5 Genetics: A Review <br>6 Organic Evolution <br>7 The Reproductive Process <br>8 Principles of Development <br>PART THREE<br>Diversity of Animal Life<br>9 Architectural Pattern of an Animal <br>10 Taxonomy and Phylogeny of Animals <br>11 Unicellular Eukaryotes <br>12 Sponges and Placozoans <br>13 Radiate Animals <br>14 Acoelomorpha and Mesozoa <br>15 Polyzoa and Kryptrochozoa <br>16 Molluscs <br>17 Annelids and Allied Taxa <br>18 Smaller Ecdysozoans <br>19 Trilobites, Chelicerates, and Myriapods <br>20 Crustaceans <br>21 Hexapods <br>22 Echinoderms, and Hemichordates <br>23 Chordates <br>24 Fishes <br>25 Early Tetrapods and Modern Amphibians <br>26 Amniote Origins and Nonavian Reptiles <br>27 Birds <br>28 Mammals <br>PART FOUR<br>Activity of Life<br>29 Support, Protection, and Movement <br>30 Homeostasis: Osmotic Regulation, Excretion, and Temperature Regulation <br>31 Homeostasis: Internal Fluids and Respiration <br>32 Digestion and Nutrition <br>33 Nervous Coordination: Nervous System and Sense Organs <br>34 Chemical Coordination: Endocrine System <br>35 Immunity <br>36 Animal Behavior <br>PART FIVE<br>Animals and Their Environments<br>37 Animal Distributions <br>38 Animal Ecology <br><br>