Natural Selection Crossword

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Across
  1. 3. (passing traits to offspring)
  2. 4. (continuation of existence)
  3. 5. (variety in population)
  4. 6. (random genetic change)
  5. 8. (immediate descendants)
  6. 11. (physical expression)
  7. 13. (beneficial trait)
  8. 15. (units of heredity)
  9. 17. (gene shuffling)
  10. 18. (struggle for resources)
  11. 19. (group of same species)
  12. 23. (organism that hunts)
  13. 24. (differences in traits)
  14. 25. (genetic makeup)
Down
  1. 1. (disappearance of species)
  2. 2. (single step in descent)
  3. 7. (adjustment to environment)
  4. 9. (distinguishing feature)
  5. 10. (external factors)
  6. 12. (surrounding conditions)
  7. 14. (producing offspring)
  8. 16. (change over time)
  9. 20. (organisms that interbreed)
  10. 21. (hiding mechanism)
  11. 22. (reproductive success)