correct the text by inserting or removing commas. there should be a total of four commas. (note: in this…

correct the text by inserting or removing commas. there should be a total of four commas. (note: in this skill, serial commas are not optional.) on october 5, 2009 elizabeth h. blackburn, carol w. greider, and jack w. szostak were awarded the nobel prize. the american scientists discovered, a mechanism involved in cellular aging.

correct the text by inserting or removing commas. there should be a total of four commas. (note: in this skill, serial commas are not optional.) on october 5, 2009 elizabeth h. blackburn, carol w. greider, and jack w. szostak were awarded the nobel prize. the american scientists discovered, a mechanism involved in cellular aging.

Answer

Brief Explanations:

  1. First, after "2009", a comma is needed to separate the date from the following name: "On October 5, 2009, Elizabeth H. Blackburn, Carol W. Greider, and Jack W. Szostak were awarded the Nobel Prize."
  2. Then, remove the comma after "discovered" as it is incorrect: "The American scientists discovered a mechanism involved in cellular aging."
  3. Now, check the commas: the date comma, two serial commas in the names, and we need one more. Wait, original text has some commas. Let's re - evaluate. The correct text should be: "On October 5, 2009, Elizabeth H. Blackburn, Carol W. Greider, and Jack W. Szostak were awarded the Nobel Prize. The American scientists discovered a mechanism involved in cellular aging." Wait, no, the total should be four commas. Let's list the commas:
    • After "5, 2009" (1)
    • After "Blackburn" (2)
    • After "Greider" (3)
    • Wait, we need a fourth. Wait, maybe the original text's "discovered," is wrong. Let's correct the text properly: "On October 5, 2009, Elizabeth H. Blackburn, Carol W. Greider, and Jack W. Szostak were awarded the Nobel Prize. The American scientists discovered a mechanism involved in cellular aging." Wait, no, that's three commas. Wait, maybe I made a mistake. Let's look again. The correct text with four commas: "On October 5, 2009, Elizabeth H. Blackburn, Carol W. Greider, and Jack W. Szostak were awarded the Nobel Prize. The American scientists discovered a mechanism involved in cellular aging." No, that's three. Wait, maybe the original "discovered," is wrong, and we need to adjust. Wait, the correct text should be: "On October 5, 2009, Elizabeth H. Blackburn, Carol W. Greider, and Jack W. Szostak were awarded the Nobel Prize. The American scientists discovered, a mechanism involved in cellular aging." No, that's incorrect. Wait, no, the correct usage: when "discovered" is followed by a noun phrase, no comma. So the error is the comma after "discovered". So to get four commas:
    • "On October 5, 2009, Elizabeth H. Blackburn, Carol W. Greider, and Jack W. Szostak were awarded the Nobel Prize. The American scientists discovered a mechanism involved in cellular aging." Wait, this is three commas. Wait, maybe the date: "October 5, 2009" has one comma, then after "2009" another, then after "Blackburn", after "Greider" – that's four. Yes: "On October 5, 2009, Elizabeth H. Blackburn, Carol W. Greider, and Jack W. Szostak were awarded the Nobel Prize. The American scientists discovered a mechanism involved in cellular aging." Wait, the commas are: after "5", after "2009", after "Blackburn", after "Greider" – that's four. And remove the comma after "discovered".

Answer:

On October 5, 2009, Elizabeth H. Blackburn, Carol W. Greider, and Jack W. Szostak were awarded the Nobel Prize. The American scientists discovered a mechanism involved in cellular aging.