Biological species concept speciation biological

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Biological Species Concept Speciation Biological Species Concept Group of individuals capable of fertile interbreeding Reproductively isolated Speciation Process by which new species evolves from earlier Most basic process in macroevolution Interpreting Species and Groups Fossils Traces or remnants of organisms Found in geological beds Taphonomy Study of how bones and other materials came to be buried and preserved as fossils Evolutionary History Continental Drift important Movement of continents on sliding plates of earth’s surface Large landmasses have shifted drastically Groups of animals become isolated from each other by oceans
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Processes of Macroevolution Adaptive Radiation Rapid expansion and diversification of new life-forms into new ecological niches Modes of Evolutionary Change Gradualism versus Punctuated Equilibrium Phyletic Gradualism Evolutionary change accumulates gradually Punctuated Equilibrium Evolutionary change proceeds through long periods of stasis Species basically unchanged for thousands of generations Long period punctuated by rapid periods of change End
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