The survival of coral colonies, which are composed of : GMAT Sentence Correction (SC)
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# The survival of coral colonies, which are composed of

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The survival of coral colonies, which are composed of [#permalink]

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28 Jun 2012, 18:44
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81% (01:31) correct 19% (00:29) wrong based on 69 sessions

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The survival of coral colonies, which are composed of innumerable tiny polyps living in a symbiotic relationship with brilliantly colored algae, are being threatened, experts say, not only by pollutants like agricultural runoff, oil sticks, and trash, but also by dropped anchors, probing drivers, and global warming.
A. are being threatened, experts say, not only by pollutants like
B. are being threatened, experts say, by not only pollutants such as
C. is not only being threatened, experts say, by pollutants such as
D. is not only being threatened, experts say, by pollutants like
E. is being threatened, experts say, not only by pollutants such as
[Reveal] Spoiler: OA

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Last edited by dvinoth86 on 28 Jun 2012, 19:28, edited 1 time in total.
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Re: The survival of coral colonies: Meaning matters!! [#permalink]

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28 Jun 2012, 18:52
dvinoth86 wrote:
The survival of coral colonies, which are composed of innumerable tiny polyps living in a symbiotic relationship with brilliantly colored algae, are being threatened, experts say, not only by pollutants like agricultural runoff, oil sticks, and trash, but also by dropped anchors, probing drivers, and global warming.
A. are being threatened, experts say, not only by pollutants like
B. are being threatened, experts say, by not only pollutants such as
C. is not only being threatened, experts say, by pollutants such as
D. is not only being threatened, experts say, by pollutants like
E. is being threatened, experts say, not only by pollutants such as

Here's my train of thought:

Identify the subject first. The subject is "survival." Since this is a singular noun, it is a singular verb. So we eliminate choices (A) and (B). The here is the "trash" is "of coral colonies, which are composed of innumerable tiny polyps living in a symbiotic relationship with brilliantly colored algae,"

To make understanding easier, I could do: The survival[s] of coral colonies, which are composed of innumerable tiny polyps living in a symbiotic relationship with brilliantly colored algae,[/s] are being threatened, experts say, not only by pollutants like agricultural runoff, oil sticks, and trash, but also by dropped anchors, probing drivers, and global warming.

See that? So we eliminate (A) and (B)

The next split is the use of "like" and "such as"

See, as per the GMAT, we use "such as" to present examples. So we eliminate (D)

The last split comes from idiom (not only x but also y) that requires parallel elements. We see that C's elements are not parallel even though we have the correct idiom. We eliminate (C)

We are left with (E).

One of the more important takeaways in this question is: Your last resort in sentence correction is to memorize idioms. This is very counter-productive since you should focus on the meaning first. And of course, remember that arguably, the GMAT's most favorite topic is parallelism.

Hope I helped.

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Last edited by gmatsaga on 28 Jun 2012, 19:05, edited 1 time in total.
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Re: The survival of coral colonies: Meaning matters!! [#permalink]

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28 Jun 2012, 19:05
1amongus wrote:
I think you meant (E).

Thanks for pointing it out. Kudos!
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Re: The survival of coral colonies: Meaning matters!! [#permalink]

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30 Jun 2012, 02:24
Highlights :-

IS- survival
BEING- can't be used along with not only..but also
NOT ONLY..BUT ALSO- parellel
SUCH AS- examples are given

+1 for (E)
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Re: The survival of coral colonies, which are composed of [#permalink]

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28 May 2014, 15:52
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Re: The survival of coral colonies, which are composed of   [#permalink] 28 May 2014, 15:52
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