Use the drop down menus to complete the paragraph describing the events related to the reintroduction of the grey wolves into Yellowstone National Park.(6 points)

Before people understood their importance in the ecosystem, the
was hunted almost to extinction. Because of this, the
population grew much too large. They overgrazed and caused significant reduction in the population of
. When the grey wolf was reintroduced, they began to naturally
the population of elk. This allowed the cottonwood tree population to
. After several years of adjustment, all three populations
and showed healthy oscillation in the ecosystem

Before people understood their importance in the ecosystem, the grey wolf was hunted almost to extinction. Because of this, the wolf population grew much too large. They overgrazed and caused significant reduction in the population of elk. When the grey wolf was reintroduced, they began to naturally control the population of elk. This allowed the cottonwood tree population to flourish. After several years of adjustment, all three populations balanced out and showed healthy oscillation in the ecosystem.