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An increasing body of scientific research suggests that the overall health of the human microbiome – consisting of as many as 1000 different species of bacteria in the gut alone – is not only influenced by diet and alcohol consumption, but also are by behavioral factors as diverse as insomnia, exercise, and oral hygiene.

Idiom : Not only X but also Y , X and Y should be parallel

(A) not only influenced by diet and alcohol consumption, but also are by-Incorrect
X and Y here are not parallel , so idiom is not used properly , parallelism error

(B) not only influenced by diet and alcohol consumption, but also- Incorrect
here also X and Y are not parallel influenced is not repeating and but also require a by to be parallel

(C) influenced not only by diet and alcohol consumption, but also are by-Incorrect
Use of are is not necessary , to be parallel we need only but also by

(D) influenced not only by diet and alcohol consumption, but also by-Correct
idiom used correctly and no parallelism error ,conveys meaning correctly


(E) influenced not only by diet and alcohol consumption, but also - Incorrect
idiom requires a by after but also for X and Y to be parallel
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An increasing body of scientific research suggests that the overall health of the human microbiome – consisting of as many as 1000 different species of bacteria in the gut alone – is not only influenced by diet and alcohol consumption, but also are by behavioral factors as diverse as insomnia, exercise, and oral hygiene.

(A) not only influenced by diet and alcohol consumption, but also are by - incorrect, because "not only influenced" implies but ... and here we need a verb (for example, ... formed). Besides, "are" is incorrect.
(B) not only influenced by diet and alcohol consumption, but also - the same mistake as in A.
(C) influenced not only by diet and alcohol consumption, but also are by - "are" is wrong here, because the sentence is about the overall health. Besides, "are" here sounds flawed.
(D) influenced not only by diet and alcohol consumption, but also by - correct parallel structure
(E) influenced not only by diet and alcohol consumption, but also - -we need "by" here.
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An increasing body of scientific research suggests that the overall health of the human microbiome – consisting of as many as 1000 different species of bacteria in the gut alone – is not only influenced by diet and alcohol consumption, but also are by behavioral factors as diverse as insomnia, exercise, and oral hygiene.

Original sentence uses not only .. but also idiom so we check proper usage in all options.

(A) not only influenced by diet and alcohol consumption, but also are by – WRONG. ‘Influenced’ and ‘are’ are not parallel. ‘Is’ followed by a verb is much better.
(B) not only influenced by diet and alcohol consumption, but also – WRONG. After not only influenced by should be parallel to something after but also. Also, ‘by’ is missing before Behavioral factors.
(C) influenced not only by diet and alcohol consumption, but also are by – WRONG. Using ‘are’ after but also is proper and kills parallelism.
(D) influenced not only by diet and alcohol consumption, but also by – CORRECT. This one properly uses idiom ‘not only by X …. But also by Y.
(E) influenced not only by diet and alcohol consumption, but also – WRONG. ‘By’ is missing leading to improper parallelism.

IMO Answer (D).
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An increasing body of scientific research suggests that the overall health of the human microbiome – consisting of as many as 1000 different species of bacteria in the gut alone – is not only influenced by diet and alcohol consumption, but also are by behavioral factors as diverse as insomnia, exercise, and oral hygiene.

(A) not only influenced by diet and alcohol consumption, but also are by --> Incorrect. Subject-Verb error. Health is singular but 'are' is used in the 'but also' section here.

(B) not only influenced by diet and alcohol consumption, but also --> Incorrect. Since the verb in the second part is not given, 'not only' should be after influenced in the first part.

(C) influenced not only by diet and alcohol consumption, but also are by --> Incorrect. Subject-Verb error. Health is singular but 'are' is used in the 'but also' section here.

(D) influenced not only by diet and alcohol consumption, but also by --> Correct. All the errors in the other sentences are corrected here.

(E) influenced not only by diet and alcohol consumption, but also --> Incorrect. Meaning error. Subject - Verb error. The 'but also' part doe not have an error. Moreover the second part is incomplete as it does not indicate what behavioral factors do.
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An increasing body of scientific research suggests that the overall health of the human microbiome – consisting of as many as 1000 different species of bacteria in the gut alone – is not only influenced by diet and alcohol consumption, but also are by behavioral factors as diverse as insomnia, exercise, and oral hygiene.

underlined portion is not following the parallelism for not only A .... but also B...
As per the sentence health is influenced by 1) diet and alcohol consumption and 2) behavioral factors.
Therefore influenced should come before not only or should come after both not only and but also.


(A) not only influenced by diet and alcohol consumption, but also are by --> Error as identified. Incorrect.
(B) not only influenced by diet and alcohol consumption, but also --> but also is not followed by influenced by. Incorrect.
(C) influenced not only by diet and alcohol consumption, but also are by --> influenced correctly used before not only. parallelism is not maintained. but also are by is not parallel to not only by. Incorrect.
(D) influenced not only by diet and alcohol consumption, but also by --> influenced correctly used before not only. not only by is parallel to but also by. Correct.
(E) influenced not only by diet and alcohol consumption, but also --> influenced correctly used before not only. not only by is not parallel to but also. Incorrect.

Answer Choice: D
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An increasing body of scientific research suggests that the overall health of the human microbiome – consisting of as many as 1000 different species of bacteria in the gut alone – is not only influenced by diet and alcohol consumption, but also are by behavioral factors as diverse as insomnia, exercise, and oral hygiene.

(A) not only influenced by diet and alcohol consumption, but also are by—> wrong: not only <-Ed been> but also <are by>
(B) not only influenced by diet and alcohol consumption, but also—> wrong: not only <-Ed been> but also <adjective...> construction
(C) influenced not only by diet and alcohol consumption, but also are by—> wrong: not only <by...>but also <are by>
(D) influenced not only by diet and alcohol consumption, but also by—> correct: not only <by ....> but also <by....> construction
(E) influenced not only by diet and alcohol consumption, but also—> wrong: not only <by ....>but also <adjective>

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An increasing body of scientific research suggests that the overall health of the human microbiome – consisting of as many as 1000 different species of bacteria in the gut alone – is not only influenced by diet and alcohol consumption, but also are by behavioral factors as diverse as insomnia, exercise, and oral hygiene.

Elements used under the idiom not only but also must be parallel and the sentence should convey the correct meaning.

(A) not only influenced by diet and alcohol consumption, but also are by- Incorrect. Not Only influenced But also are behavior factors is not parallel. As per the meaning the health of microbiome is influenced by two factors that are diet and alchohol consumption and behavioral factors as diverse as insomnia, exercise, and oral hygiene. Also the usae of plural "are" is incorrect. it cannot refer back to health
(B) not only influenced by diet and alcohol consumption, but also-Incorrect. What ever is followed by Not only must also be followed by But also to maintain the parallel structure. This distorts the meaning of the sentence as explained in A
(C) influenced not only by diet and alcohol consumption, but also are by- Incorrect. The verb are in this sentence distorts the parallel structure and is not needed. besides it's wrong. plural verb "are" cannot refer back to singular Health .
(D) influenced not only by diet and alcohol consumption, but also by- Correct. This conveys the correct meaning and maintain the parallelism.
(E) influenced not only by diet and alcohol consumption, but also -Incorrect. Same as explained in C. "By" is missing after but also
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An increasing body of scientific research suggests that the overall health of the human microbiome – consisting of as many as 1000 different species of bacteria in the gut alone – is not only influenced by diet and alcohol consumption, but also are by behavioral factors as diverse as insomnia, exercise, and oral hygiene.

Error Analysis and Solution

(A) not only influenced by diet and alcohol consumption, but also are by-- There are 2 errors in this sentence :
1)- The overall health of the human microbiome is influenced by diet and alcohol consumption and also by by behavioral factors and other things. So, the word INFLUENCED should act as an umbrella word for all the influencing the overall health of the human microbiome. In short, there is a parallelism error in the statement around not only-but also.
2)- There is a S/V error in the sentence as well, The overall health of something is a singular subject, so the use of verb "are" creates a S-V agreement error in the sentence.


(B) not only influenced by diet and alcohol consumption, but also-- There are 2 errors in this sentence :
1)- The overall health of the human microbiome is influenced by diet and alcohol consumption and also by by behavioral factors and other things. So, the word INFLUENCED should act as an umbrella word for all the influencing the overall health of the human microbiome. In short, there is a parallelism error in the statement around not only-but also.
2)- For the parallelism to work, there is a need of using "BY" after but-also as well.


(C) influenced not only by diet and alcohol consumption, but also are by--
Now in this sentence, the first error of parallelism has been fixed but the S/V agreement has been introduced by the use of "Are"


(D) influenced not only by diet and alcohol consumption, but also by--

Correct



(E) influenced not only by diet and alcohol consumption, but also--
For the parallelism to work, there is a need of using "BY" after but-also as well.

IMO D

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There should be Parallelism in "not only..., but also..."

(A) not only influenced by diet and alcohol consumption, but also are by
Incorrect. 'to be' verb is already used before '...not only..' form. Also, '...Influenced..., are by...' are not parallel here.

(B) not only influenced by diet and alcohol consumption, but also
Incorrect. "...influenced" ---"...behavioral factors" are not parallel (...verb--...noun)

(C) influenced not only by diet and alcohol consumption, but also are by
Incorrect. There shouldn't be 'are' after 'but also' to be parallel with 'by diet.'

(D) influenced not only by diet and alcohol consumption, but also by behavioral factors
Correct. '...by diet,...by behavioral factors' are parallel

(E) influenced not only by diet and alcohol consumption, but also
Incorrect. There should be 'by' after 'but also...'

The answer choice is D.
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An increasing body of scientific research suggests that the overall health of the human microbiome – consisting of as many as 1000 different species of bacteria in the gut alone – is not only influenced by diet and alcohol consumption, but also are by behavioral factors as diverse as insomnia, exercise, and oral hygiene.

(A) not only influenced by diet and alcohol consumption, but also are by - Incorrect parallelism is not correct. Not only..but also form should be parallel
(B) not only influenced by diet and alcohol consumption, but also - Incorrect parallelism is not correct.Not only..but also form should be parallel
(C) influenced not only by diet and alcohol consumption, but also are by - Incorrect verb form are.
(D) influenced not only by diet and alcohol consumption, but also by - Correct. Parallelism is correct here
(E) influenced not only by diet and alcohol consumption, but also - Incorrect parallelism is not correct.Not only..but also form should be parallel

Answer = D
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check for parallesim
by must be there

influenced must be out of not only but also close

option d
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Shahalikhan
check for parallesim
by must be there

influenced must be out of not only but also close

option d

Hi Shahalikhan,

Let’s first figure out why the spokesperson uses the first boldface. I hope you agree that he tells about the changes that are likely to happen in 12 years (such as government change, etc) in order to criticize the CURRENT strategy, NOT the new one. The following are step by step explanation why A is incorrect.

1. The spokesperson thinks that the TIMING of the current strategy is its biggest flaw.

2. Later he shows WHY this timing is a biggest flaw. The REASONS he gives against the current strategy are in the first boldface.

3. His main GOAL in showing those reasons (in the first boldface) IS to explain why the state needs a NEW strategy.

So you can see that the spokesperson uses the first boldface to create basis (to explain why) for a course of action (new strategy) that he ENDORSES (wants), but NOT criticizes.

To create a basis for a strategy means – to show some solid reasons why this strategy is important. Thus the first boldface is the basis (reason) for the ENDORSED strategy, but NOT the criticized one. That’s why A is incorrect.

If A were as follows, it would be correct:

A. The first is an assumption that forms the basis for a course of action that the argument criticizes endorses.
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