speciation

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