Watch "How Wolves Changed Rivers" on YouTebe This video got nothing wrong if you search it and you see wrong things you have the right to report me but fr I need help

***And answer the following question please ASAP ASAP please

1. Why did the "deer" (they are really elk) leave the valleys when the wolves were re-introduced to Yellowstone?

2. When the elk left the valleys, what happened to the vegetation? Give specific examples.

3. Once the vegetation changed, what wildlife came back?

4. How did the wolves change the rivers?

5. How did the elk change the rivers when the wolves were removed from Yellowstone National Park?

Please help