What plays the role of the negative control in the ames test and would you expect any colã³nies to originate on plates treated with this control? why? why not?

Option B

The principle difference between point source and nonpoint source water pollution is  the number of sources of pollution

Point source pollution happens principally from industrial pieces of equipment and public wastewater processing plants. Nonpoint-source pollution is more difficult to recognize and harder to inscribe. It is pollution that originates from various places, all at once.

Nonpoint source pollution may descend from numerous diverse sources with no particular solution handy to improve the obstacle, causing it hard to control. The impacts of nonpoint source pollutants on particular waters change and may not forever be completely exacted. All of the aforementioned pollutions are possible to deviate up in rivers, streams, and lakes.