Across
- 2. A diagram showing evolutionary relationships.
- 6. Organisms that show traits of both ancient and modern groups.
- 7. When one species evolves into many different species.
- 8. An organism’s ability to survive and produce offspring.
- 12. The study of where organisms live around the world.
- 14. Structures with similar functions but different evolutionary origins.
- 16. When two species evolve in response to each other.
- 18. The age of a rock or fossil compared to others.
- 19. Human breeding of organisms for desired traits.
- 20. Organisms with helpful traits survive and reproduce more successfully.
- 21. When unrelated species develop similar traits.
Down
- 1. Traits gained during life that were once thought to be passed to offspring.
- 3. Layers of rock where fossils are found.
- 4. A trait that helps an organism survive in its environment.
- 5. Structures that have little or no function today.
- 9. The study of embryos and their development.
- 10. When related species become more different over time.
- 11. The idea that natural disasters caused major changes on Earth.
- 13. The idea that all species come from common ancestors and change over time.
- 15. The actual age of a rock or fossil in years.
- 17. Structures that are similar because they came from a common ancestor.