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Unformatted text preview: Reading Assignment 6 1. What was Da rwin’s view of mass extinctions? How did that fit in with his overall view of evolution? How did the Signor-Lipps effect explain Da rwin’s data in exactly the opposite manner? Darwin had a gradualistic view of mass extinction. He believed that it was more gradual and steady. Some species eventually disappear from the Earth for natural reasons (ie: without catastrophes). He made some exceptions to his rule, like the ammonites extinction. This fit in well with his overall view of evolution as a slow and steady process. If there were a quick extinction that wiped out many species, this would implicate that a new creation of life would start again relatively briefly, which is against evolution. The Signor-Lipps effect is a way to model the way in which one would expect to find fossils in a mass extinction. Darwin’s data showed a gradual “petering out” of certain species in the fossil record. This does not indicate a gradual extinction, but rather represents the rarity of...
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- Winter '10
- Evolution, mass extinction, negative evidence