About the Authors	20 Terrestrial Mandibulates
Preface	21 Smaller Protostome Phyla
Part One. Introduction to Living Animals	22 Echinoderms and Hemichordates
1 Life: Biological Principles and the Science of Zoology	23 Chordates
2 The Origin and Chemistry of Life	24 Fishes
3 Cells as Units of Life	25 Early Tetrapods and Modern Amphibians
4 Physiology of Cells	26 Amniote Origins and Reptilian Groups
Part Two. Continuity and Evolution of Animal Life	27 Birds
5 Genetics: A Review	28 Mammals
6 Organic Evolution	Part Four. Activity of Life
7 The Reproductive Process	29 Support, Protection, and Movement
8 Principles of Development	30 Homeostasis: Osmotic Regulation, Excretion, and Temperature Regulation
Part Three. Diversity of Animal Life	31 Internal Fluids and Respiration
9 Architectural Pattern of an Animal	32 Digestion and Nutrition
10 Classification and Phylogeny of Animals	33 Nervous Coordination: Nervous System and Sense Organs
11 Protozoan Groups	34 Chemical Coordination: Endocrine System
12 Mesozoa and Parazoa	35 Immunity
13 Radiate Animals	36 Animal Behavior
14 Acoelomate Bilateral Animals	Part Five. Animals and Their Environment
15 Pseudocoelomate Animals	37 The Biosphere and Animal Distribution
16 Molluscs	38 Animal Ecology
17 Segmented Worms
18 Arthropods	Glossary
19 Aquatic Mandibulates	Credits
	Index