Scientists notice a steady decline in the population of wolves that will affect the populalation of wolves for four years...1. make a prediction...

I would predict that the population of moose in this area will be increasing soon.  The major reason for this is, I assume, that wolves are a major predator of moose.  If they wolf population is declining, this means that there will be fewer wolves to prey on the moose and the moose population will increase.

It is hard to know what would cause the wolf population to increase because we don't know why it is decreasing.  If the wolf population is decreasing for lack of food, then we can predict that it will increase in coming years.  This will be true because the moose population will rise, providing more food for the wolves.