How wolves change rivers > Task 1]]>One Question Per PagefalsefalseWolves had never lived in Yellowstone National Park before 1995.2Before 1995, there were so many deer in the park that the ecosystem was suffering.1The main impact of the wolves was that they ate a lot of deer.2Plants in different parts of the park regenerated because the deer avoided them.1Wolves and beavers create specific habitats for other plants and animals.1The numbers of birds in the park also grew due to the increased availability of food.1The wolves made the rivers go in different directions.2This video shows that just one change can have a very big effect across a whole system.1https://339efcb25eb75e967b0d-ff8eeadd950d51fd1fc939dca75b3973.ssl.cf1.rackcdn.com/assets_green.swf