Answer the questions below. A minimum of 5 sentences is expected for your initial response.What were three effects of wolves being absent?What were three effects of wolves being present?What caused the rivers to change?Why is this situation considered a trophic cascade?What makes wolves the keystone species in this situation?Research another keystone species in a different ecosystem. Describe how a trophic cascade in this new ecosystem might occur. Citations should be in APA format. Sources should be reliable and non-biased.watch- https://www.youtube.com/watch?v=ysa5OBhXz-Q (Links to an external site.)For This or a Similar Paper Click Here To Order Now