Chapter 22 - Chapter 22-Descent with Modification: A...

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Chapter 22-Descent with Modification: A Darwinian view of life Overview Evolution can be defined as Darwin’s phrase descent with modification and also viewed as both a pattern and a process 1. The Darwinian revolution challenged traditional views of a young Earth inhabited by unchanging species. a. The study of fossil record; it contains observable data regarding both the morphological development and biogeographical distribution of early cetaceans b. Lamarck hypothesized that species evolve through use and disuse of body parts and the inheritance of acquired characteristics. These characteristics aren’t genetically coded. c. Darwin perceived adaptation to the environment and the origin of new species as closely related processes. (Evolutionary adaptations are inherited characteristics that enhance an organism’s ability to survive and reproduce in a particular environment) i. Descent with modification explains life’s unity and diversity ii. Natural selection is a cause of adaptive evolution
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Chapter 22 - Chapter 22-Descent with Modification: A...

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