When wolves were reintroduced to Yellowstone National Park in the United States after being absent nearly 70 years, the most remarkable "trophic cascade" occurred. What is a trophic cascade and how exactly do wolves change rivers?
years ago by tommee
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Ten years after a tragic car accident, Kellie wants to find the heroes that saved her son’s life and thank them.
Posted 1 year ago by Deezy
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