3. Bark beetles are native to U. S. forests and play important ecological roles. In terms of the crosscutting concept of Stability and Change, describe how an increase in the bark beetle
population affects the ecosystem as a whole.

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water