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Chapter 1: Adaptation by Natural Selection Chapter 1: Adaptation by Natural Selection
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Chapter objectives
Explaining Adaptation before Darwin
Darwin’s Theory of Adaptation
Darwin’s Postulates
An Example of Adaptation by Natural Selection
Individual Selection
The Evolution of Complex Adaptations
Why Small Variations Are Important
Why Intermediate Steps Are Favored by Selection
Rates of Evolutionary Change
Darwin’s Difficulties Explaining Variation
Key terms
Study questions