It has been particularly useful in understanding how populations diverge and how reproductive barriers arise.

As he put it down in a circle, there was a flash on the board and between the figures arose a barrier, mirror bright.

Obstacles, barriers, pitfalls and setbacks will always arise when you think you are getting there.

The creatures in the panel seemed to flutter as that barrier arose.

Not quite, of course, for Tritt had been angry and withdrawn so that interpersonal contact had weakened and the barrier of displeasure had arisen.

This is a reversal, but new barriers and interests have arisen to block such a transformation.

The barriers arise because polluters see little reason to spend on new and better technology unless the Government makes them do so.

The report makes a useful point in emphasising that the initial barriers to people with disabilities arise mainly during childhood.

To begin with, I would point out that barriers to trade may arise with regard to partners outside the Community if a separate European reusability label is adopted.

The first barrier arises because the value effect is only partly a result of the long-run tendency of value stocks to outperform the market.