Modern hybrids are typically easier to grow in artificial conditions than their parent species.

Some arms-control advocates voiced skepticism about the artificial conditions in the test.

These are usually more adaptable to artificial conditions than their botanical ancestors.

This is natural selection speeded up by the artificial conditions.

Other communities have ceased to exist due to natural or artificial conditions.

Even now, does not an East-end worker live in such artificial conditions as practically to be cut off from the natural surface of the earth?

"Modern medicine allows this artificial condition to be temporary," Control replied.

They start askin' questions about how to cause humanity to abandon cities and artificial conditions of living.

But recently, the dynamics seem to have forced a fresh set of artificial conditions on the business.

Would you wish to bear a child for a life of imprisonment able to live only in our artificial conditions such as this?