The word which means "can be helpful or harmful depending on the point of view" is beaver. Beaver can both have a good and a bad effect to the ecosystem. In a good point of view, beaver serves as natural filters segregating sediments from flowing to bodies of water. On the other hand, it can also cause flooding.
I would be happy to help if given more than information
The colonists felt nothing but resentment about the Navigation Acts. The Navigation Acts limited their trade with nations other than England.
