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A theoretical framework that encompasses several basic mechanisms is consistent with the patterns seen in nature; and there is abundant evidence demonstrating the action of these mechanisms as well as their contributions to nature.
Hence, evolution is both a theory and a set of established facts that the theory explains.
Compare Charles Darwin’s views with that of his friend and colleague, Alfred Russel Wallace.
For example, microbiologist James Shapiro of the University of Chicago declared in National Review that, "There are no detailed Darwinian accounts for the evolution of any fundamental biochemical or cellular system, only a variety of wishful speculations" (Shapiro 1996). In Trends in Ecology and Evolution Tom Cavalier-Smith, an evolutionary biologist at the University of British Columbia, wrote, "For none of the cases mentioned by Behe is there yet a comprehensive and detailed explanation of the probable steps in the evolution of the observed complexity.The fossil fish Priscacara liops found in sediments dating from the Eocene epoch (55.8 ± 0.2 to 33.9 ± 0.1 mya) in present day Green River, a tributary of the Colorado, USA. Scientific understanding requires both facts and theories that can explain those facts in a coherent manner.Evolution, in this context, is both a fact and a theory.Go to the Museum’s home page to learn much more about paleontology and evolution.Second link provided below takes you to the calendar of events.