Evolution Test Review

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Across
  1. 2. deepest layers are the oldest
  2. 6. all of the fossils we have collected so far
  3. 7. similar organisms that can reproduce together
  4. 8. diagram that shows how organisms are related
  5. 9. preserved remains of an organism
  6. 11. no longer alive, anywhere on Earth
  7. 12. random changes in DNA made during reproduction
  8. 13. slight genetic differences between individuals of the same species
  9. 14. features in an organism’s environment that affect its survival and reproduction
Down
  1. 1. organisms with the best traits survive and reproduce
  2. 3. species can change over a long time
  3. 4. humans choose which organisms reproduce, based on desired traits
  4. 5. how well an organism’s traits help it survive in its environment
  5. 10. special traits that help an organism survive in its environment