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Evidences of Evolution

Evidences of Evolution. Fossils. Shows gradual change over time Simpler = older and deeper in the rocks. Fossils. Give an actual glimpse of the past Direct evidence as to what existed before history of incremental development from one species to another Evidence for common

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Evidences of Evolution

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  1. Evidences of Evolution

  2. Fossils • Shows gradual change over time • Simpler = older and deeper in the rocks

  3. Fossils • Give an actual glimpse of the past • Direct evidence as to what existed before • history of incremental development from one species to another • Evidence for common descent & common ancestry

  4. What is a Fossil • The remains of a dead organism, usually found in rocks • Can be bones,casts, footprints, burrows, or whole bodies trapped in amber (insects trapped in fossilized tree sap • When formed in rock, minerals fill the pores and crystallize • Hard tissues fossilize better than soft

  5. Aging Fossils – Geological Time Scale

  6. Aging Fossils – Carbon Dating

  7. DNA • Similar sequences indicate how closely related organisms are to one another

  8. DNA Barcoding

  9. Biochemistry • Cytochrome c, a protein needed for cellular respiration, is found in all living things Number of DNA base differences out of about 300

  10. Homologous Structures • Similar structures with different functions • Suggest common ancestry

  11. Vestigial Structures • Structures that exist but appear to have no function • Suggest common ancestor with functioning versions of those structures

  12. Embryos • Similar looking embryos suggest common ancestry

  13. Behavior • Similar behaviors suggest common ancestry • Ex. Head movements of all waterfowl

  14. Domestication

  15. Climate Change Forces organisms to adapt, or go extinct Explains why you find fossils of sea creatures in a place that’s now a prairie http://www.cbc.ca/news/canada/manitoba/story/2010/07/16/mb-ancient-fish-fossil-manitoba.html http://www.huffingtonpost.ca/2011/07/19/mosasaur-fossils-found-in_n_903792.html

  16. Fossil of a Marine Organism, found in a desert

  17. Biogeography/Geographical Distribution • The existence of similar species on separate continents supports continental drift theory • AKA Paleogeography

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