Across
- 2. Had different shaped shells depending on the island they are from.
- 5. Required for new species to form.
- 8. When organisms disappear from the Earth.
- 11. Well-supported testable explanation
- 12. The ship that Darwin traveled on.
- 14. Structures that have no current function.
- 15. Natural selection is also known as the survival of the ________.
- 16. Formation of a new species.
- 17. Islands that Darwin visited.
- 18. The name of Darwin's book: The _____ of the Species
- 19. proposed the theory of evolution by natural selection
- 20. When one species evolves into many; adaptive __________
Down
- 1. Pattern of evolution where a species is stable for a long time then rapidly changes: _______________ equilibrium
- 3. When two unrelated organisms look alike (sharks and dolphins)
- 4. Structures that are similar in structure.
- 6. Principle that states that living species are descended from ancient ones; descent with _______.
- 7. Had different shaped beaks depending on the island they are from.
- 8. Change over long periods of time.
- 9. Preserved remains of ancient organisms.
- 10. A characteristic that helps an organism survive.
- 13. Process by which evolution occurs: Natural _____________
- 19. Refers to the variety of living things.