Wolves change rivers
Wolves are being killed by people. Yellowstone park is killing wolves because they thought the wolves were doing bad.
Years later the Yellowstone park would be affected in negative ways. The Yellowstone park population and geography is effected in a negative way. The Elk eating the grass did not give other animals food.
Yellowstone park would try to restore Yellowstone park as it was. To do that they would get the wolves back to Yellowstone park.
This would affect Yellowstone park in a positive way. The wolves would also become the keystone specie. They would change the elk behavior.
This would later help balance the animal's population in a positive way. For example grow some specific populations like the beaver population.
The wolves would also change the geography of Yellowstone park in a positive way. A positive way the wolves made was change the geography of the rivers and improve them. The wolves would also bring back certain population back and fixing the food chain.
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