Across
- 3. change over time
- 4. sudden growth of alot of new species many times after a mass extinction
- 7. isolationism where organisms are separated by long distances
- 8. isolation when there are differences in mating rituals
- 9. isolation when mating times are different
- 10. isolation when species live in different habitats
- 12. similiar characteristics in unrelated species
- 13. one species grows into many descendent speciesover many environments
- 14. isolationism after the zygote forms
- 15. isolation when sperm and egg just won't work together
- 17. elimination of a species from earth
- 18. isolation when structures keep sperm and egg apart
Down
- 1. hybrid is sterile or has defects
- 2. zygote fails to develop or mature
- 5. 2 or more species evolve in response to changes in each other
- 6. the rise of 2 or more species from 1 species
- 11. evolution takes long period of time with small changes
- 14. isolationism before zygote forms
- 16. closely related species evolve to become different