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September 19, 2013 Evidence for Evoltion.docx

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York University
Natural Science
NATS 1610

EVIDENCE for Evolution Thursday September 19, 2013 Lines of Evidence: 1. Fossil Evidence: o The fossil record 2. Anatomical Evidence: o Comparative anatomy o Comparative embryology o Vestigial structures 3. Biochemical Evidence: 1. Fossil Evidence: • The fossil record of history of life recorded by remains from the past • Most fossils are mineralized in sedimentary rocks- become rock o Dead organisms settle with sediments o Some parts decay, some are preserved by fossils  Hard parts that are rich in minerals- shells, bones, teeth  Organic material can change if under right conditions • Orderly appearance of fossils within strata of sedimentary rocks Non-Decomposed Fossils: forms when an organism dies someplace where it can’t decay • Such as: frozen in ice, preserved in acid bogs, trapped in resin • Entire body may be preserved, including soft tissues, some even retain DNA 2. Comparative anatomy & Embryology: • Homologous structures suggest shared ancestry • Analogous structures arise when different lineages evolve in the same or similar environments • Resemblance early in development indicated common descent o Some animals have similar embryo’s, but they start to differ as they develop Vestigial Organs: no longer serve any purpose • Animals with vestigial structures had evolved
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