Contents：

ch 1 An Introduction to Life on Earth

Unit 1 The Life of a Cell
ch 2 Atoms, Molecules, and Life
ch 3 Biological Molecules
ch 4 Cell Structure and Function
ch 5 Cell Membrane Structure and Function
ch 6 Energy Flow in the Life of a Cell
ch 7 Capturing Solar Energy: Photosynthesis
ch 8 Harvesting Energy: Glycolysis and Cellular Respiration

Unit 2 Inheritance
ch 9 The Continuity of Life: Cellular Reproduction
ch 10 Patterns of Inheritance
ch 11 DNA:The Molecule of Heredity
ch 12 Gene Expression and Regulation
ch 13 Biotechnology

Unit 3 Evolution and Diversity of Life
ch 14 Principles of Evolution
ch 15 How Populations Evolve
ch 16 The Origin of Species
ch 17 The History of Life
ch 18 Systematics: Seeking Order Amidst Diversity
ch 19 The Diversity of Prokaryotes and Viruses
ch 20 The Diversity of Protists
ch 21 The Diversity of Plants
ch 22 The Diversity of Fungi
ch 23 Animal Diversity I: Invertebrates
ch 24 Animal Diversity II: Vertebrates

Unit 4 Behavior and Ecology
ch 25 Animal Behavior
ch 26 Population Growth and Regulation
ch 27 Community Interactions
ch 28 How Do Ecosystems Work?
ch 29 Earth's Diverse Ecosystems
ch 30 Conserving Earth's Biodiversity

Unit 5 Animal Anatomy and Physiology
ch 31 Homeostasis and the Organization of the Animal Body
ch 32 Circulation
ch 33 Respiration
ch 34 Nutrition and Digestion
ch 35 The Urinary System
ch 36 Defenses Against Disease
ch 37 Chemical Control of the Animal Body: The Endocrine System
ch 38 The Nervous System
ch 39 The Senses
ch 40 Action and Support: The Muscles and Skeleton
ch 41 Animal Reproduction
ch 42 Animal Development

Unit 6 Plant Anatomy and Physiology
ch 43 Plant Anatomy and Nutrient Transport
ch 44 Plant Reproduction and Development
ch 45 Plant Responses to the Environment