11.   Ecologists say that humans have so altered the natural landscape that rules of migration that applied in the past may not apply as well in the future.

12.   For Reilly and others, eliminating pollution only to see the natural landscape steadily decay would be a disappointing achievement.

13.   Here at Pleasant Bay, he is drawing on as much of the natural landscape as he can.

14.   Helping computers on military helicopters rapidly distinguish enemy tanks and other armored vehicles from the natural landscape in a variety of weather conditions.

15.   If Kamp has his way, that natural landscape will be as undisturbed as possible.

16.   In the bush of Africa or the forests of Latin America, the genetic technology might someday become a part of the natural landscape.

17.   Native plant experts, they were appalled at residential construction during which the natural landscape is bulldozed and replaced with high-maintenance plant materials foreign to the area.

18.   Other people, of course, see an eyesore, an ugly gash by the hand of man across a magnificent natural landscape.

19.   Such well-thought-out toythink is constantly contrasted with a persuasively natural suburban landscape.

20.   Television commercials narrated by actor Paul Newman and print ads featuring natural landscapes made their debut recently in Portland, Ore., Denver and Charlotte, N.C.