Answer:
Decreases.
Explanation:
Decrease occurs in beaver colonies when wolves were reintroduced in the area because wolves feed on beaver and as a result, the population of beaver decreases. There is a direct relationship between the number of beaver colonies and the willow tree ring area because willow tree is a source of food for beavers so if willow tree are more in the area, more food available for the beaver and they will increase in number.
