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Chpt. 22 Evidences of Evolution: Evidences of Evolution: Evidences of Evolution: Other Evidences of Evolution: 1. Comparative Anatomy Anatomical similarities between species in the same “taxonomic” category. Other Evidences of Evolution: HomologySimilar structure resulting from common ancestry/different function. Homologou s structures Evidences of Evolution: Similar structure resulting from common ancestry/ different function. similar structure, different function Evidences of Evolution: similar structure, Similar structure different function resulting from common ancestry/diffe rent function. Vestigial Organsstructures with only marginal importance Historical remnants of snake “legs” structures that had important functions in Vestigial Organsstructures with only marginal importance Vestigial Organsstructures with only marginal importance Historical remnants of snake “legs” structures that had important functions in Vestigial Organsstructures that seem to have lost their Historical functionality remnants of structures that had important functions in eye bulbs Vestigial Organsstructures that seem to have lost their functionality Historical remnants of structures that had important functions in wings Other Evidences of Evolution: Embryological- limb buds - dolphin Closely related organisms go through similar stages in their embryological development Other Evidences of Evolution: Embryological- pharyngeal pouches Closely related organisms go through similar stages in their embryological development Other Evidences of Evolution: Molecular HomologiesDNA / RNA amino acid sequence Other Evidences of Evolution: Molecular HomologiesDNA / RNA amino acid Species have genes and sequence protein sequences that match closely Evidences of Evolution: 2. Biogeography - the geographic distribution of species Evidences of Evolution: 2. Biogeography ??Why are two islands, same environment, found in two different parts of the world, not found with similar species?? Evidences of Evolution: 2. Biogeography Why are island species similar to their mainland (even when not the same environment)?? Evidences of Evolution: 2. Biogeography ??Why are species that are similar to those on the mainland… not similar to those found in the same environment elsewhere?? Evidences of Evolution: 3. Fossil Record- (ex. vertebrates) Chronological appearance of different classes of organisms: birds mammals reptiles amphibians Evidences of Evolution: 3. Fossil Recordillustrates that organisms did not make their appearance at the same time.