Read this sentence. All cars that are not registered will be towed to the nearest impound lot. Identify the relative clause, whether it is essential to the meaning of the sentence, and if it requires commas. A. The clause is “that are not registered.” It is essential. It does not require a comma. B. The clause is “to the nearest impound lot.” It is essential. It does not require a comma. C. The clause is “that are not registered.” It is non-essential. It does require a comma. D. The clause is “to the nearest impound lot.” It is non-essential. It does require a comma.

 Relative clause is "that are not registered." It is essential to the meaning of the sentence and, therefore, does not require commas.

Explanation:

A clause that starts with a relative pronoun (who, that, which, whose, where, when) is called a relative clause. The purpose of these clauses is to provide more information about the noun that precedes them. In this case, relative clause "that are not registered" is used to describe the noun "cars." It is essential to the meaning of the sentence, since it tells us which cars in particular will be towed to the nearest impound lot. If a clause provides important information, it is considered essential and does not require commas.

many were disgusted, nauseated and shook their heads with disapproval upon finding out about the recycling of water process. however, they do not seem to understand that this process actually saves water.

although individuals may argue that it is unhealthy, and or unsafe to drink water that is "from toilet to tap" , the water is 100% safe to drink and involves forcing the water across a membrane, which "removes   any impurities, including viruses, pharmaceuticals and dissolved minerals" , according to paul rozin, a psychology professor who studies revulsion.

i agree that that the thought of drinking water that once ran through someones kitchen sink isn't quite appealing, but recycled wastewater is safe to drink. it also saves water. "the city produces nine million gallons a day" claims russell schreiber, the city’s director of public works.

recycled waste water has absolutely no health concerns whatsoever. when wastewater goes into a system, it's absorbed back into the ground. thus, it goes into a sewer system, then goes through a treatment process that removes contaminants before being released. nonetheless, there is no problem in drinking water that has been recycled.

"in drought-ed california, there are six state agencies that use wastewater that comes from an intellectual property source," according to the university of california, riverside. studies show that this water is completely safe to drink, however, it still doesn't mean people are going to happily pour it in a water glass.

researchers hope it "may make consumers more amenable to drinking recycled wastewater," extraordinarily, women who have a higher "disgust reaction" and make most consumer purchasing decisions.