Evolution

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Across
  1. 2. number and relative abundance of various species
  2. 4. best suited for their environment survive and reproduce
  3. 8. formation of new species
  4. 9. homologous organs that are no longer used
  5. 10. body parts that have different mature forms
Down
  1. 1. evolutionary history of a species
  2. 3. change over time
  3. 5. any inherited trait makes an organism
  4. 6. individual's ability to reproduce
  5. 7. physically similar structures