1.   Since excavation involves destruction of much of the evidence, it is an unrepeatable exercise.

2.   Bush has said he opposes federal spending on stem cell research that involves the destruction of living human embryos.

3.   But exploitation does not have to involve destruction.

4.   But of the two principal ways in which the stem cells can be harvested, the more convenient involves the destruction of a living embryo.

5.   But officials here are also mindful that an earlier terrorist plot involved the destruction of the airport.

6.   By law, federal money cannot be used for research involving the destruction of embryos.

7.   He interceded to force construction of the classical Jefferson Memorial, which some opposed partly because it involved the destruction of cherry blossoms.

8.   However, embryonic stem cell research is controversial, since it involves the destruction of early human embryos.

9.   Obviously, proposals for deploying a missile defense system or for financing research that involves the destruction of human embryos do not stand or fall together.

10.   Romney spoke extensively about his position on stem cell research, which also involves embryo destruction.