But a number of scientists question the assumption that alien species are never acceptable in a natural ecosystem.

But growing numbers of Palestinians have questioned the high cost in lives lost and economic devastation.

A number of Australian officers later questioned the caution with which it had been conducted.

But a growing number of economists question whether the effect is significant.

A growing number of analysts question whether they will remain so profitable much longer.

A growing number on the left are questioning the traditional idea of using courts to achieve a more liberal society.

A number of international scholars have questioned that court's legitimacy.

Far more important, growing numbers of Americans question the President's haste.

Even a number of the devout questioned the need for the proposal.

But a growing number of villagers are questioning whether they took a wrong turn.