Therefore, where genetic variation is depleted in a population, migration of breeding animals from a different population is the only practical means of regeneration to enable selection. (cgejournal.biomedcentral.com)
The most practical means by which I could get my proof was by accumulating it in graduate school. (sciencemag.org)
They're the only practical means of rapidly addressing two crises — global warming and our dependence on finite energy resources largely derived from the world's most volatile regions. (thestar.com)