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Unformatted text preview: Punctuated Equilibrium According to another model based on the fossil record, speciation occurs rapidly over a short time, followed by a long period of little or no change. "Short" means thousands or hundreds of thousands of years. This differs greatly from Darwin's original view of slow and gradual change continuing over very long periods of time. Evidence for Evolution Evolution, which started out as a hypothesis, is now supported by evidence from many fields of science. Fossils: Evidence of Past Life The fossil record is the history of life recorded by remains from the past. Fossils include skeletons, shells, seeds, insects trapped in amber, dung, DNA and other chemicals, imprints of leaves, and tracks of organisms that lived in the distant past. Most fossils are at least 10,000 years old....
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