Part I. The Conceptual Basis of Zoology. The Nature of Science and the Science of Nature. The Core of Modern Biology: Evolution. Part II. Life and Its Continuity. The Molecules of Life. The Origin of Life. The Eukaryotic Cell: Structure and Evolution. Genetics I: The Fundamental Observations of Heredity. Genetics II: The Molecular Basis of Inheritance. Evolution I: The Origin of Evolutionary Novelty. Evolution II: Populations, Species, And Macroevolution. Part III. Animal Form and Function. Symmetry, Form and Life Style. Body Covering, Support, And Movement. Digestion and Nutrition. Cellular Respiration, Gas Exchange, And Metabolic Rates. Internal Transport. The Immune System. Excretion and Water Balance. The Nervous System. Receptors and Sense Organs. The Endocrine System. Behavior. Reproduction. Embryonic Development. Part IV. Animal Diversity. Taxonomy, Phylogeny and the Origin and Evolution of the Animal Kingdom. Protozoa. Sponges. Cnidarians. Flatworms. The Alschelminthes. Molluscs. Annelids. Arthropods I: Chelicerata and Crustacea. Anthropods II: Uniramions. Bryozoans. Echinoderms. Hemichordates and Chordates. Fishes. Amphibians. Reptiles. Birds. Mammals. Primates and Human Evolution. Part V. Interactions of Organisms and Their Environment. Population Ecology. Communities and Ecosystems. Appendices. Credits. Glossary. Index.