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KEY CONCEPT Evidence of common ancestry among species comes from many sources.

Explore the various sources of evidence that support the concepts of common ancestry and evolution, including fossils, geography, embryology, anatomy, and structural patterns. Learn about homologous and analogous structures, as well as vestigial structures that provide clues to the history of species.

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KEY CONCEPT Evidence of common ancestry among species comes from many sources.

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  1. KEY CONCEPT Evidence of common ancestry among species comes from many sources.

  2. Evidence for evolution in Darwin’s time came from several sources. • Fossils provide evidence of evolution. • Fossils in older layers are more primitive than those in the upper layers.

  3. island species most closely resemble nearest mainland species • populations can show variation from one island to another • The study of geography provides evidence of evolution.

  4. Larva Adultbarnacle Adult crab • identical larvae, different adult body forms • similar embryos, diverse organisms • Embryology provides evidence of evolution.

  5. Homologous structures are similar in structure but different in function. • Homologous structures are evidence of a common ancestor. • The study of anatomy provides evidence of evolution. Molefoot Batwing Human hand

  6. The study of anatomy provides evidence of evolution. • Analogous structures have a similar function. • Analogous structures are not evidence of a common ancestor. Human hand Mole foot Bat wing Fly wing

  7. Structural patterns are clues to the history of a species. • Vestigial structures are remnants of organs or structures that had a function in an early ancestor. • Ostrich wings are examples of vestigial structures.

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