Paleontological Evidence (The Fossil Record)

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Paleontological Evidence(The Fossil Record)

• A record of all fossils ever discovered which
  demonstrates the changes in organisms structure
  over time

• Transitional forms (missing links) have been
  found to show relationships between ancient forms
  and modern ones
• Fossils can be dated radioactively to determine
  their age accurately

http//www.pbs.org/wgbh/evolution/library/03/4/l_0
34_05.html
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2. Biogeographical Evidence

• Unrelated species living in different regions of
  the world with similar environmental features
  happen to look alike
• Supports natural selection idea
• Unrelated anteaters around the world share common
  features because of their common selective
  pressures (food, primarily)

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Biogeographical Evidence
Convergent Evolution
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3. Comparative Anatomy (morphology) a. Vestigial
Structures

• Structures that remain on an organism which have
  no purpose, or are not used for their original
  purpose anymore
• Examples
• Human appendix
• Whale hip bones
• Penguin/Ostrich wings

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3. Comparative Anatomy (morphology)b. Homologous
Structures

• Structures on different species which are similar
  in form, but different in function
• Examples
• The arm bones of various organisms

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Homologous Structures
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4. Embryological Evidence

• Embryos of a variety of organisms look extremely
  similar at early stages of development then
  take on differences later

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5. Molecular Biological Evidence

• Organisms share a great deal of the same DNA
• The closer an organism is to its ancestor, the
  more DNA is the same
• Humans/Chimps 98 the same DNA
• One organisms DNA works in another organism
  (same building blocks and inner machinery)
• Human DNA can substitute for yeast DNA and allow
  the yeast to live normally

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Other New Evidences

• Population genetics
• Biochemistry
• Genomics