Across
- 2. Structures that are similar.
- 3. Has different shaped beaks depending on which island their from.
- 8. Structures that have no current function.
- 9. The process by which evolution occurs; natural _____.
- 12. Has different shells depending on the island their from.
- 13. When one species evolves into many; adaptive ________
- 15. Required for new species to form.
- 17. Proposed the theory of evolution by natural selection.
- 18. When two species evolve together.
- 19. Islands that Darwin visited.
- 20. The study of the Earth.
Down
- 1. When two unrelated organisms look alike (shareks & Dolphins).
- 4. Preserved remains of ancient organisms.
- 5. Formation of a new species.
- 6. A characteristic that helps an organism survive.
- 7. Natural selection is also known as survival of the _______.
- 10. Change over time.
- 11. The name of Darwins book; The ____ of Species.
- 14. When organisms disapear from the earth.
- 16. Refers to the variety of living things.