Section 1.1: What is biology?      Section 1.2: The Methods of Biology      Section 1.3: The Nature of Biology

Section 2.1: Organisms and Their Environment      Section 2.2: Nutrition and Energy Flow

Section 3.1: Communities      Section 3.2: Biomes

Section 4.1: Population Dynamics      Section 4.2: Human Population

Section 5.1: Vanishing Species      Section 5.2: Conservation of Biodiversity

Section 6.1: Atoms and Their Interactions      Section 6.2: Water and Diffusion      Section 6.3: Life Substances

Section 7.1: The Discovery of Cells      Section 7.2: The Plaza Membrane      Section 7.3: Eukaryotic Cell Structure

Section 8.1: Cellular Transport      Section 8.2: Cell Growth and Reproduction      Section 8.3: Control of the Cell Cycle

Section 9.1: The Need for Energy      Section 9.2: Photosynthesis: Trapping the Sun's Energy      Section 9.3: Getting Energy to Make ATP

Section 10.1: Mendel's Laws of Heredity      Section 10.2: Meiosis

Section 11.1: DNA: The Molecule of Heredity      Section 11.2: From DNA to Protein      Section 11.3: Genetic Changes

Section 12.1: Mendelian Inheritance of Human Traits      Section 12.2: When Heredity Follows Different Rules      Section 12.3: Complex Inheritance of Human Traits

Section 13.1: Applied Genetics      Section 13.2: Recombinant DNA Technology      Section 13.3: The Human Genome

Section 14.1: The Record of Life      Section 14.2: The Origin of Life

Section 15.1: Natural Selection and the Evidence for Evolution      Section 15.2: Mechanisms of Evolution

Section 16.1: Primate Adaptation and Evolution      Section 16.2: Human Ancestry

Section 17.1: Classification      Section 17.2: The Six Kingdoms

Section 18.1: Viruses      Section 18.2: Archaebacteria and Eubacteria

Section 19.1: The World of Protists      Section 19.2: Algae: Plantlike Protists      Section 19.3: Slime Molds, Water Molds, and Downy Molds

Section 20.1: What is a fungus?      Section 20.2: The Diversity of Fungi

Section 21.1: Adapting to Life on Land      Section 21.2: Survey of the Plant Kingdom

Section 22.1: Nonvascular Plants      Section 22.2: Non-Seed Vascular Plants      Section 22.3: Seed Plants

Section 23.1: Plant Cells and Tissues      Section 23.2: Roots, Stems, and Leaves      Section 23.3: Plant Responses

Section 24.1: Life Cycles of Mosses, Ferns, and Conifers      Section 24.2: Flowers and Flowering      Section 24.3: The Life Cycle of a Flowering Plant

Section 25.1: Typical Animal Characteristics      Section 25.2: Body Plans and Adaptations

Section 26.1: Sponges      Section 26.2: Cnidarians      Section 26.3: Flatworms      Section 26.4: Roundworms

Section 27.1: Mollusks      Section 27.2: Segmented Worms

Section 28.1: Characteristics of Arthropods      Section 28.2: Diversity of Arthropods

Section 29.1: Echinoderms      Section 29.2: Invertebrate Chordates

Section 30.1: Fishes      Section 30.2: Amphibians

Section 31.1: Reptiles      Section 31.2: Birds

Section 32.1: Mammal Characteristics      Section 32.2: Diversity of Mammals

Section 33.1: Innate Behavior      Section 33.2: Learned Behavior

Section 34.1: Skin: The Body's Protection      Section 34.2: Bones: The Body's Support      Section 34.3: Muscles for Locomotion

Section 35.1: Following Digestion of a Meal      Section 35.2: Nutrition      Section 35.3: The Endocrine System

Section 36.1: The Nervous System      Section 36.2: The Senses      Section 36.3: The Effects of Drugs

Section 37.1: The Respiratory System      Section 37.2: The Circulatory System      Section 37.3: The Urinary System

Section 38.1: Human Reproductive Systems      Section 38.2: Development Before Birth      Section 38.3: Birth, Growth, and Aging

Section 39.1: The Nature of Disease      Section 39.2: Defense Against Infectious Diseases