Which bodies of water serve as a source of drinking water for some U. S. And Canadian cities, and are facing serious pollution problems? A. Hudson Bay and Labrador Sea B. St. Lawrence River and Hudson River C. Great Lakes D. Atlantic Ocean and Great Lakes

St. Lawrence River

Explanation:

The pollution is caused by agricultural industries. The industries discharge a lot of chemicals and waste such as pesticides. Even though some people swim in that river and is tested frequently due to those discharge, the water isn't considered safe drinking water because of bacteria. A lot of people decided to not swim in the water because there have been reports of plastic being found and the color of the river changed to a brownish nasty looking water. It used to be clear water before the pollution started.

In the pictures below are some before and after pollution  

the use of electrical signals that transit messages is know as

d.

thist title points out that you are explaining the nature of the u.s. government. it is the most specific. a representative government consists of a government where decisions are taken according to a voting system. the most essential aspect of a representative government is found in the different structures where voting rights are granted to different groups of people. for example, voting for governor, mayor, president, local police chief etc.