1.The population is controlled through the use of food sources. When the food source is high the wolf population will increase, however if it is low the population will decrease. Food goes up, so does wolf population, food goes down, so does wolf population. 2. The mesopredators would have been controlled both through the direct contact of the apex predator, as well as the competing for food with the apex predators. The apex is better at hunting and killing which is why it is the apex. It is able to out hunt the mesopredators. 3.This one confused me. The answer is in the description before the questions, literally "The wolves were removed to protect domestic sheep,". The humans didn't think about the consequences and acted blindly.
...unless environmental changes occur. These probable environmental changes could influence the supply of food, the condition of shelter and the environment to sustain life and support the population.