In this same forest ecosystem mentioned above, what are one possible reason the wolf population might decline?

Since you didnt give an excerpt I can't answer. But I can give you advice. Read through and see If you can find, maybe less food or a higher predator or something like that

Explanation:

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

delete this answer while you can