historyoflife2-2 - History of life 1. phylogenies show...

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History of life 1. phylogenies show patterns of common ancestry as inferred from shared character states branching sequence---Ex: humans and chimps are more closely related to each other than mouse find evidence of past life (fossils) and assign dates to the fossils (#2) these two bodies of evidence generally correspond—compare order of common ancestors with order of first appearances FOSSIL RECORD fossils are remains of once living organisms generally found in sedimentary rocks age of rocks gives time of preservation can learn about environment of deposition uniformitarianism - Hutton's geological cycle: sedimentation---rock formation---uplift--- erosion and weathering---sediment transport. ..goes back to sedimentation. “no vestige of beginning, and no prospect of an end” Lyell (also geologist)- developed uniformitarianism -same processes occur at same rate. Major influence on Darwin. Uniformitarianism= continuous operation of the rock or geological cycle produces geological formations. Replaced caatastrophism. Earth is millions of years old, not 6000.
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This note was uploaded on 11/11/2009 for the course BIOEE 2780 taught by Professor Geber during the Spring '07 term at Cornell University (Engineering School).

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historyoflife2-2 - History of life 1. phylogenies show...

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