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