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Text File  |  1992-09-02  |  321b  |  9 lines
  1. The independent evolution of similar
  2. structures in species (or other taxonomic
  3. groups) that are not closely related, as a
  4. result of living in a similar way. Thus,
  5. birds and bats have wings, not because they
  6. are descended from a common winged ancestor,
  7. but because their respective ancestors
  8. independently evolved flight.
  9.