Across
- 4. species occupy different habitats
- 6. people play a part in traits passed down
- 9. occurs rapidly
- 11. organism exists an area
- 12. species change by becoming different
- 13. organisms only alive during a certain area that can be used to determine the age of the rock
- 15. structures have similar functions
- 16. similar anatomical arrangements
- 17. specific shapes of flowers and birds beak
- 20. strongest piece of evidence
- 21. shows stages of organisms over time
Down
- 1. needed by ancestors not modern organism
- 2. fossils found in the same area will increase in age as the rock layer gets deeper
- 3. gametes don't form zygote
- 5. courtship patterns for recognizing mates differ
- 7. hybrid offspring dies
- 8. incompatible animal genitalia
- 10. how well an organisms can survive in an environment
- 14. species change by becoming more like each other
- 18. gradually occurs
- 19. a distinct group of organisms that can interbreed and produce fertile offspring