Why did the removal if wolves affect the entire Yellowstone ecosystem?

The removal of wolves from Yellowstone disrupted the natural balance of the ecosystem, leading to an overpopulation of herbivores like elk. This overpopulation resulted in overgrazing, which damaged vegetation and affected the growth of trees and plants along riverbanks. The decline in plant life further impacted other species, including beavers and birds, disrupting habitats and reducing biodiversity. The reintroduction of wolves in 1995 highlighted their crucial role as apex predators in maintaining the health of the ecosystem.