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Note for B 1.3

Note for B 1.3. Many types of evidence support evolution. Observations provide evidence for theories. Theory— a widely accepted statement based on scientific evidence that helps explain and predict natural phenomena Theory of Evolution— based on three sources of evidence: Fossil Biological

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Note for B 1.3

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  1. Note for B 1.3 Many types of evidence support evolution

  2. Observations provide evidence for theories. • Theory—a widely accepted statement based on scientific evidence that helps explain and predict natural phenomena • Theory of Evolution—based on three sources of evidence: • Fossil • Biological • genetic

  3. Fossil evidence supports evolution. • Fossil evidence shows that 2 speciees with a common ancestor can develop differently. • Ancestor—a distant or early form of an organism from which later forms descend

  4. Biological evidence supports evolution. • Includes the structure and development of living things • Includes vestigial organs and similar structures with different functions • Vestigial organs—physical structures that are longer useful to a living organism, but may have existed as fully developed similar structures useful to a common ancestor (vestigial limb in a whale)

  5. Biological evidence (continued) • Different species share many similar structures, but these have different functions, such as the forelimbs of a bat, gecko, lizard, or manatee. • Similarities is embryonic development also indicate common ancestry.

  6. Genetic development supports evolution. • Similar organisms have very similar genes; less closely related organisms have genes that are easy to tell apart. • Organisms with similar patterns of DNA also share common ancestors.

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