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Evidence for Evolution
7A Analyze and evaluate how evidence of common ancestry among groups is provided by the fossil record, biogeography, and homologies, including anatomical, molecular, and developmental.
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Common Ancestry
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Fossils
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Newest or youngest fossils
Fossil Record Newest or youngest fossils Oldest fossils
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Biogeography
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Homologous Structures
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Vestigial Structures
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Molecular Homologies
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Developmental Homology
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Phylogenetic Tree
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Cladogram
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Common Ancestry Group of related species all come from (with some differences) the same ancestor Ex: tigers and lions came from saber tooth cat
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Fossils Preserved remains of ancient organisms Ex: dinosaur fossils
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Fossil Record How species have evolved from their ancestors
Ex: horse fossil record
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Biogeography Study or where species now live and where they & their ancestors used to live
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Homologous Structures
Structures that show similarities between groups or organisms
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Vestigial organs Structures that still exist in animal but no longer have any use Ex: Hind leg bones on whales Ex: Caudal vertebrae in humans (tail)
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Molecular Homologies Comparing DNA & protein structures
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Developmental Homology
Comparing similar structures during development of embryos
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