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    Evolution of Life #1 (M)

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    ridhaandeshpande
    The document discusses evidence that scientists use to support the theory of evolution, including fossils, biogeography, and the Law of Superposition. Fossils provide evidence of evolution through traces of long-dead organisms. Biogeography, the study of geographical distribution of fossils, and the Law of Superposition, which states that successive rock layers were deposited over time with the lowest being oldest, also provide relative dating evidence for evolution.

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    Evolution of Life #1 (M)

    Uploaded by

    ridhaandeshpande
    11 views17 pages
    The document discusses evidence that scientists use to support the theory of evolution, including fossils, biogeography, and the Law of Superposition. Fossils provide evidence of evolution through traces of long-dead organisms. Biogeography, the study of geographical distribution of fossils, and the Law of Superposition, which states that successive rock layers were deposited over time with the lowest being oldest, also provide relative dating evidence for evolution.

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    - Evolution of Life #1 [M]

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    The document discusses evidence that scientists use to support the theory of evolution, including fossils, biogeography, and the Law of Superposition. Fossils provide evidence of evolution through traces of long-dead organisms. Biogeography, the study of geographical distribution of fossils, and the Law of Superposition, which states that successive rock layers were deposited over time with the lowest being oldest, also provide relative dating evidence for evolution.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    11 views17 pages

    Evolution of Life #1 (M)

    Uploaded by

    ridhaandeshpande
    The document discusses evidence that scientists use to support the theory of evolution, including fossils, biogeography, and the Law of Superposition. Fossils provide evidence of evolution through traces of long-dead organisms. Biogeography, the study of geographical distribution of fossils, and the Law of Superposition, which states that successive rock layers were deposited over time with the lowest being oldest, also provide relative dating evidence for evolution.

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    © All Rights Reserved
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    Download as pptx, pdf, or txt
    of 17

    Evolution

    Explain what types of evidence Please watch the video above


    scientists use to support the to help you answer the
    theory of evolution? question.
    Today’s Learning
    Target
    • Explain how fossils, biogeography and the Law of
    Superposition provide evidence of evolution.
    Wake County Pre-Assessment
    What does evolution mean? Draw
    an example and explain.
    What is Evolution?
    • It means that all living things on Earth are probably descended
    from a common ancestor.

    • The great diversity of organisms is the result of more than 3.5


    billion years of evolution that has filled our Earth with life forms.

    • The millions of different species of plants, animals, and


    microorganisms that live on earth today are related by descent
    from common ancestors.
    Theory:
    In science, a theory is not a guess !

    It is a well-substantiated, well-supported,
    well-documented explanation for our
    observations. Some people think that in
    science, you have a theory and once its proven
    it becomes law.

    Theories do not become laws


    The concepts of common descent and natural selection
    were first proposed by Charles Darwin in his famous book,

    The Origin of Species in 1859.


    Why are these two moths different?
    Why are these two moths different?
    Evidence for Evolution comes from different sources
    and
    various disciplines:
    1. Fossils
    2. Biogeography
    3. The Law of Superposition
    4. Artificial Selection
    5. Vestigial Organs: The evolutionary legacy we carry within our
    own bodies
    6. Similarities: Comparative Anatomy
    7. Overwhelming Genetic Evidence (not available in Darwin’s
    time)
    1. Fossils:
    Traces of long-dead organisms
    • A fossil mold is formed by the impression left in
    rock by the remains of an organism.
    What is Biogeography?
    After watching the video, explain what
    biogeography is and an example.
    2. Biogeography:
    the study of the geographical distribution of fossils.
    • Alfred Wallace was very interested in biogeography because he noticed that
    rivers and mountains often formed boundaries between different species.
    • Wallace knew that biogeography was related to natural selection.
    • Moritz Wegener’s theory of plate tectonics (1915) helped make sense of
    Wallace’s findings.
    3. The Law of Superposition
    • Successive layers of rock or soil were
    deposited on top of one another by wind
    or water
    • The lowest layer (stratum) will be the
    oldest.
    • Relative age: a given fossil is younger or
    older than what is below or above it
    • Absolute age: actual numerical age based
    on dating of sediment around fossil
    How could you test evolution using the Law
    of Superposition?
    When asked what would make him doubt evolution, the famous
    biologist, J.B.S. Haldane, answered, “Find me a rabbit fossil in Pre-
    Cambrian Rock.”

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