Fact 1: Elk populations in Yellowstone National Park had increased significantly, leading to overgrazing of willow plants.
Fact 2: Wolves were reintroduced to the park, resulting in a decline in elk numbers.
Observation: The recovery of willow populations coincided with the reintroduction of wolves, suggesting a relationship between predator presence and plant health.
Inference: The presence of wolves likely restored ecological balance by controlling the elk population, allowing vegetation like willow to thrive, which in turn supports other wildlife and improves overall ecosystem health.