Changes over Time

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Across
  1. 1. fossil and DNA are ____ to evolution
  2. 3. a change in an organism that helps them survive in their environment
  3. 6. survival of the fittest (2 words)
  4. 9. man's destruction of this endangers species
  5. 12. body parts that are similar across species are called ___ structures
  6. 13. Darwin formed the ____ of evolution
  7. 14. studied birds in the Galapagos
Down
  1. 2. the slow process by which species have developed over time
  2. 4. a slight change in a trait
  3. 5. scientist who studies fossils
  4. 7. a species that is no longer alive
  5. 8. in danger of becoming extinct
  6. 10. imprint of an organism once alive
  7. 11. a mistake or variation in the DNA