You are a paleontologist studying fossil snails in sedimentary rock layers exposed on the cliff walls of a canyon. You observe that new, morphologically distinct species appear almost suddenly in thin rock layers, but then remain relatively unchanged for millions of years (several rock layers). Your observations lend support to which model of evolutionary change? A. Punctuated equilibrium B. Adaptive radiation C. Recapitulation D. Phyletic gradualism E. Allopatric speciation
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the fossil record shows that an organism is relatively unchanged for a long period of time, followed by several changes over a short period of time, followed by another period of stability. this provides evidence for which view of evolution? A. biotic potential B. monophyletic development C. graduated speciation D. punctuated equilibrium
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The fossil record indicates that in some cases reasonably well-defined species appear suddenly and remain unchanged for a long time before they become extinct. This phenomenon is referred to as: a. allopatric speciation b. sympatric speciation c. phyletic gradualism d. punctuated equilibrium e. parallel evolution
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