21. They are particularly notable for their ecological speciation and large size. 22. Speciation , however, appears to have been unusually drawn-out.23. In plants, polyploidy must be included in any view of speciation . 24. Reinforcement favoring reproductive isolation is required for both parapatric and sympatric speciation . 25. Evidence for the role ecology plays in the process of speciation exists. 26. This validates the reproductive isolation mechanism, a key component of speciation . 27. Nevertheless, some TEs generate large families often associated with speciation events. 28. The speciation diagram for citric acid was produced with the program HySS. 29. Many of these rapid changes may contribute to reproductive isolation and speciation . 30. Even the differences between recognized subspecies are probably a matter of gradient speciation
