Evolution

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Across
  1. 2. Random changes in gene frequency (10)
  2. 3. Small-scale evolution within a species (10)
  3. 4. Useless structures from past adaptations (7)
  4. 7. Proof supporting a theory (7)
  5. 8. Copying another organism's appearance (7)
  6. 9. Supercontinent millions of years ago (7)
  7. 12. Disappearance of a species (9)
  8. 14. Process driving evolution, "survival of the..." (14)
  9. 16. Ability to survive and reproduce (7)
  10. 18. Characteristic that helps an organism survive (9)
  11. 20. Large-scale evolution, leading to new groups (11)
  12. 21. Scientist famous for his theory of evolution (6)
Down
  1. 1. Breeding that chooses certain traits (8)
  2. 5. Formation of new species (9)
  3. 6. Similar in structure but different in origin (8)
  4. 10. Complete genetic blueprint of an organism (6)
  5. 11. Drug-resistant bacteria (8)
  6. 13. Evidence of ancient life (6)
  7. 15. Similar in function but different in origin (8)
  8. 17. Study of fossils (12)
  9. 19. Study of body structure and function (7)