Evolution and Change. Chapter Thirteen: Evolution. 13.1 Evidence for Evolution 13.2 How Evolution Works 13.3 Natural Selection. Investigation 13A. Crazy Adaptations. How does the environment influence traits?. 13.2 Voyage of the Beagle.
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1. Organisms change over time.
2. All organisms are descended from common ancestors by a process of branching.
3. Evolution is gradual, taking place over a long time.
4. The mechanism of evolution is natural selection.