Algae can be found living in almost all parts of the world’s oceans

Question

Algae can be found living in almost all parts of the world’s oceans; they are an important part of the world-wide ecosystem  by virtue of their constant re-oxygenation of the water which allowed them  to rejuvenate even the most polluted environments.

A. by virtue of their constant re-oxygenation of the water which allowed them

B. by virtue of their constant re-oxygenation of the water, which allows them

C. on the grounds that their constant re-oxygenation of the water which has allowed them

D. since the constant re-oxygenation of the water that has been allowing them

E. by virtue of their constant re-oxygenation of the water allowing them

Mahmud6 · Answer

OE

The correct response is (B). This choice correctly uses the present-tense verb “allows” which agrees with the present-tense verb “are.” Additionally, it correctly places a comma before “which.”

If you chose (A), we need a comma before the word “which” to set it apart as a clear modifying phrase. The past tense verb “allowed” does not agree with the present tense verb “are” in the non-underlined portion of the second independent clause.

If you chose (C), no comma here before "which" means this choice is incorrect. We’ve also got a past perfect verb (“has allowed”) that conflicts with present tense “are” in the non-underlined portion of this sentence.

If you chose (D), remember the word “that” is restrictive meaning it is necessary to the meaning of the phrase, while "which" is not restrictive. The word “which” adds a sort of parenthetical note to a sentence.

If you chose (E), “water allowing” is unclear. We are missing a relative pronoun or a comma between “water” and “allowing.”

https://www.gmatpracticequestions.com/gm ... tice-test/

varshap · Answer

B again, because it has a comma before the word which

Thanks,
Varsha

pradeepmaria · Answer

I picked E as it is constant oxygenation that should cause rejuvenation not water as in B
Please share OA

thorX88 · Answer

Algae can be found living in almost all parts of the world’s oceans; they are an important part of the world-wide ecosystem  by virtue of their constant re-oxygenation of the water which allowed them  to rejuvenate even the most polluted environments.

A. by virtue of their constant re-oxygenation of the water  which  allowed them
  Without comma which modifies water

B. by virtue of their constant re-oxygenation of the water, which allows them
  Correct

C. on the grounds that their constant re-oxygenation of the water   which   has allowed them
  Without comma which modifies water

D. since the constant re-oxygenation of the water that has been allowing them
  It is not clear that the doer of re-oxygenation is Algae

E. by virtue of their constant re-oxygenation of the water  allowing  them
  Without comma allowing modifies water

MvArrow · Answer

In my opinion the question is poorly designed.
In the OA B "which" modifies "water" and is not correct as it should refer to "the algae virtue".
So I marked E because I supposed that the author forgot the "," before allowing

T1101 · Answer

The "which" refers to "re-oxygenation" and not to "algae virtue". Therefore, the question is designed correctly. "Which" doesn't always have to refer right to word it is next to, sometimes a modifier can be in between.

VerbalBot · Answer

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Algae can be found living in almost all parts of the world’s oceans

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Algae can be found living in almost all parts of the world’s oceans

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