Across
- 1. Changes in genes causes changes in phenotypes
- 7. Organisms best suited for environment have better chance of survival
- 9. Idea that eukaryotic cells arose from prokaryotic cells
- 15. There are not enough resources for all organisms to thrive so there is a constant struggle
- 16. Organism dies out
- 18. Means ¨second mouth¨
- 19. Remains or traces of life that have been preserved over time
- 20. 2 species evolve in response to changes in each other over time
Down
- 2. What theory Charles Darwin was known for
- 3. Preserves fossils
- 4. Breaks and classifies Earth's history into segments
- 5. Pattern of long, stable periods interrupted by brief periods of more rapid change
- 6. Ability to survive and reproduce due to inherited adaptations
- 8. Means ¨first mouth¨
- 10. A single species or a small group of species evolve
- 11. Change over time
- 12. This pattern shows unrelated organisms come to resemble one another
- 13. An idea used to account for a situation or justify a course of action
- 14. Inherited characteristics that increases an organism's chance of survival
- 17. Known for his theory of natural selection