In the USA, what type of species is the North American Beaver and why?

Question

For this question, please choose between the following options (foundation, keystone, or invasive) and explain why.

Answer 1

In the USA, the North American Beaver is considered to be a keystone species because the dams they construct will eventually be used as a habitat for various other organisms found in the surrounding ecosystem.

Removing the North American Beaver population from a given ecosystem could cause a collapse for the entire ecosystem.