 | Chapter Outline
| Natural Selection | | The Variability of Populations | | Environment, Habitat, and Niche | | The Mechanisms of Natural Selection | | Types of Natural Selection | | Natural Selection in Humans | | Natural Selection and Sickle-Cell Anemia | | Sexual Selection | | Kin Selection | | Summary |
| The Origin of Species | | The Evolution of Subspecies | | The Evolution of Species | | Specialized and Generalized Species | | Rates of Speciation | | Some Basic Concepts in Evolutionary Theory | | Summary |
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