Evolution and Natural Selection

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Across
  1. 2. arise by mutation
  2. 4. can only reproduce in a host
  3. 6. skeletal elements suggest common ancestors
  4. 8. occurs when species evolve together
  5. 11. membrane-bound cell
  6. 12. when a group separates from a larger group and develops its own charasteristics
  7. 15. any trait that helps an organism survive in its environment
  8. 16. when germs can resist treatment
  9. 17. differences in organisms
  10. 18. offspring produced by one parent
  11. 19. asexual reproduction of the body into two new bodies
Down
  1. 1. process of changing to adapt
  2. 3. a cell that has a nucleus
  3. 5. a response to a stimulus in order to survive
  4. 7. interbreeding from one species to another
  5. 9. complete disappearance of a species
  6. 10. physical changes in order to adapt to an environment
  7. 13. random change in gene variant
  8. 14. single cell organism possessing a prokaryotic