Lecture6

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Unformatted text preview: Clicker Question Clicker At the time of Darwin’s death scientists generally agreed generally 1) That evolution occurred and that mutation 1) was the cause was 2) That evolution was possible and that 2) natural selection was the likely driving force force 3) That creationism was the best explanation 3) for the origin of species for 4) That evolution was established but that 4) the mechanism was in doubt the 5) That evolution occurred and was driven 5) by acquired characteristics by 59 What new evidence do we have since Darwin? This lecture deals with two topics This 1) How do we know the age of the earth and How the fossils that we find? the 2) What do we know about transitional 2) species? species? DETERMINING THE AGE OF ROCKS AND FOSSILS ROCKS RADIOACTIVE DECAY RADIOACTIVE Methods of Testing Methods Methods of Testing Methods Methods of Testing Methods Methods of Testing Methods If the age of the earth can be detected by radiometric dating then then 1 2 3 4 5 6 60 Estimated Age 550 MYA DATA DATA 250 MYA Today Recent Rock (Surface Layers) Cambrian Rock (Deep Layers) Depth from surface Estimated Age 550 MYA DATA DATA 250 MYA Today Recent Rock (Surface Layers) Cambrian Rock (Deep Layers) Depth from surface What should we conclude? What 1)Data p...
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