Across
- 6. Archaeopteryx is a famous example of this.
- 9. Change in a species over time.
- 11. Examples include the wings of a butterfly and wings of a bird.
- 13. This has led to showy peacock feathers and big horns on bison for fighting.
- 14. There is no coming back from this.
- 15. How well-adapted an individual is for survival and reproduction.
- 16. Large-scale environmental changes that cause many species to die off in a short time.
- 17. When individuals struggle against each other for survival
- 18. Examples include wings on an ostrich and hip bones in whales
Down
- 1. Any differences in a characteristic within a species
- 2. The process that moved wolves into dogs.
- 3. Any feature that helps an individual survive in its environment.
- 4. The man who first proposed descent with modification
- 5. More of this variety leads to a higher chance of survival
- 7. Often stated as "survival of the fittest"
- 8. A human's arm, a whale's front fin, and a bat's wing are all____.
- 10. This causes dolphins, sharks, and ichthyosaurs to look similar
- 12. this molecule is the code for all living things.