Please help very ez, will brainyl and etc

Biodiversity can be measured by the number and relative abundance of species in an ecosystem. which potential solution below best addresses the issue of loss of biodiversity in a north american ecosystem? a) introduce fast growing plants light kudzu (from japan) which can become groundcover to prevent erosion. b) identify keystone species in an ecosystem and isolate them in a protected area away from other species. c) remove decomposers by applying fungicide so that more organic material is available to animals and plants. d) inspect ships moving through international waters to prevent the introduction of invasive species, which can potentially outcompete native species