02. Evidence for biological evolution

02. Evidence for biological evolution - 1 What is the...

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1 What is the evidence that organisms have actually changed, ie. evolved, over time? • Physical evidence (fossils) – pattern in time • Comparison of living forms – pattern in present day • An observable, testable process for evolutionary change (natural selection) • Sufficient time for that process to have resulted in the observed diversity of life forms 2 What are fossils, and how do we connect them together? • Organic or mineralized remains or impressions of dead organisms • Found in _______________ • Oldest are on the bottom, newest on the top • Can be dated with radiometric techniques 3 Fossils show a transition from ancient extinct forms to modern forms branching pattern • Numerous extinct “dead ends” • Those in upper strata resemble modern forms • Only genus still existing is Equus : horses, donkeys, zebras 4 5 What do vestigial structures tell us? from Campbell,
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02. Evidence for biological evolution - 1 What is the...

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