Sentence 6: Furthermore it is well known that trees improve air quality; leaves filter the air we breathe, absorb pollution, and give off oxygen.
Which of the following changes should be made to CORRECT sentence 6?

In order to correct sentence 6, you would need to insert a comma after \u201CFurthermore.\u201D A comma should be used to set off interjections and interruptions; therefore, it is necessary to place a comma after the interjection (\u201CFurthermore\u201D). The use of a semicolon after \u201Cquality\u201D is appropriate, as it is being used to join two independent clauses. The other answer options are not options that would make the sentence grammatically correct.