解析库 > PPPlus
The possibility that nonindigenous species can frequently be (i)_____ native ones with little change in many ecosystem characteristics is a hotly debated and as yet unresolved topic among ecologists and conservation biologists. The fact that one can adduce myriad examples of ecosystem (ii)_____ by nonindigenous species does not really demonstrate that all such newcomers are destined to have such impacts. Indeed, most of the introduced species that survive appear to have (iii)_____ effects on the ecosystems they have invaded.
- displaced by
- kept at bay by
- substituted for
substituted for , disruption , minimal 显示答案