Wolves prey on elk, bison, and occasionally livestock. many years ago, the government took steps to reduce the wolf population. however, in the absence of wolves, the prey populations increased disproportionately, causing a decline in the population of plant species. this decline disrupted the ecosystem. following a study of the wolves’ impact, ecologists regarded wolves as the the ecosystem, as their absence caused a effect on the ecosystem. for the first blank here are the choices: - keystone species -prey species - diverse species these are the choices for the second blank: - beneficial -domino -direct if you could me out asap, that would be great! you so much! ^_^