GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 12 Dec 2019, 19:56

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Paleontologists studying the fossil record have estimated that the

Author Message
TAGS:

### Hide Tags

SC Moderator
Joined: 23 Sep 2015
Posts: 1713
Paleontologists studying the fossil record have estimated that the  [#permalink]

### Show Tags

08 Feb 2019, 08:43
3
10
00:00

Difficulty:

75% (hard)

Question Stats:

51% (01:56) correct 49% (01:58) wrong based on 424 sessions

### HideShow timer Statistics

Project SC Butler: Day 94: Sentence Correction (SC1)

Paleontologists studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that have ever existed.

A. studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that
B. that study the fossil record have estimated that the current collection of known fossils is only 10% of all species that
C. studying the fossil record have estimated that the current collection of known fossils accounts for only 10% of all species that
D. who study the fossil record have estimated that the fossils currently collected are only approximately 10% of all species which
E. who study the fossil record estimate that the current collection of known fossils accounts for approximately 10% of all species which

The best/excellent answers get kudos, which will be awarded after the answer is revealed.
There may be no best/excellent answers, or a there may be a few excellent answers!

_________________
Simple strategy:
“Once you’ve eliminated the impossible, whatever remains, however improbable, must be the truth.”

GMAT Ninja YouTube! Series 1| GMAT Ninja YouTube! Series 2 | How to Improve GMAT Quant from Q49 to a Perfect Q51 | Time management

My Notes:
Reading comprehension | Critical Reasoning | Absolute Phrases | Subjunctive Mood
Senior Manager
Status: eternal student
Joined: 06 Mar 2018
Posts: 292
Location: Kazakhstan
GPA: 3.87
Paleontologists studying the fossil record have estimated that the  [#permalink]

### Show Tags

08 Feb 2019, 11:56
5
6
aragonn wrote:

Project SC Butler: Day 94: Sentence Correction (SC1)

Paleontologists studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that have ever existed.

Meaning:

1. There is paleontologists who study the fossil record
2. They have estimated that the current collection of known fossils accounts for only (approximately) 10% of all species that have ever existed

Errors:
Attachment:

A.JPG [ 52.96 KiB | Viewed 2216 times ]

v-ing right after the noun without comma 'studying' correctly modifies "paleontologists"
all SV pairs are in place and agree in number

One strage thing to me is "only" and "approximately"

"approximately" - close to a particular number or time although not exactly that number or time:

In December, the company reduced its workforce by approximately 5%.

"only"
Attachment:

only.JPG [ 55.18 KiB | Viewed 2220 times ]

---> Perfect explanation "Understanding the Word “Only” (Mandatory to read): <---

Keep in mind “only” is a modifier. This means that it modifies what you are trying to say and acts as a descriptive word in your sentence. “Only” can have a strong presence in a sentence and can shift the meaning of a sentence drastically if it is used incorrectly.[1] To create a clear sentence, you should place “only” next to the noun, subject, verb, or phrase you are trying to modify.
When the word “only” is misplaced in a sentence, it becomes a “misplaced modifier”. This means the modifier, for example “only”, is not placed beside the noun or other word it is trying to modify. This creates confusion on the part of the listener or reader because the sentence becomes awkward...
--->

So we have 10% of all species that have ever existed
'only' has to modify '10%' not 'approximately'

only 10% of all species that have ever existed -- correct
approximately 10% of all species that have ever existed -- correct
only approximately 10% of all species that have ever existed -- incorrect

POE

A. studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that

B. that study the fossil record have estimated that the current collection of known fossils is only 10% of all species that
('that' - cannot modify people)

C. studying the fossil record have estimated that the current collection of known fossils accounts for only 10% of all species that

D. who study the fossil record have estimated that the fossils currently collected are only approximately 10% of all species which
(same as A, 'which' - needs to be preceded by comma)

E. who study the fossil record estimate that the current collection of known fossils accounts for approximately 10% of all species which
(paleontologists estimate - present simple - it is not a general fact or rule, we don't need this tense here, 'which' - needs to be preceded by comma )

_________________
My SC approach flowchart

(no one is ideal, please correct if you see any mistakes or gaps in my explanation, it will be helpful for both of us, thank you)

___________________
"Nothing in this life is to be feared, it is only to be understood"
~ Marie Curie
##### General Discussion
Manager
Joined: 15 Nov 2015
Posts: 158
Location: India
GMAT 1: 700 Q47 V39
GPA: 3.7
Re: Paleontologists studying the fossil record have estimated that the  [#permalink]

### Show Tags

08 Feb 2019, 21:00
Paleontologists studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that have ever existed.

A. studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that
Hold, words 'only' & 'approx' placed close together doesnt make sense, hence go for option C
B. that study the fossil record have estimated that the current collection of known fossils is only 10% of all species that
'that' cannot people
C. studying the fossil record have estimated that the current collection of known fossils accounts for only 10% of all species that
Hold, only ''approx' is missing compared to option-A and it makes sense not to have both the words close together
D. who study the fossil record have estimated that the fossils currently collected are only approximately 10% of all species which
'which' should be precede by comma
E. who study the fossil record estimate that the current collection of known fossils accounts for approximately 10% of all species which
'which' should be precede by comma
SC Moderator
Joined: 23 Sep 2015
Posts: 1713
Re: Paleontologists studying the fossil record have estimated that the  [#permalink]

### Show Tags

09 Feb 2019, 08:59
aragonn wrote:

Project SC Butler: Day 94: Sentence Correction (SC1)

Paleontologists studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that have ever existed.

A. studying the fossil record have estimated that the current collection of known fossils accounts for only approximately 10% of all species that
B. that study the fossil record have estimated that the current collection of known fossils is only 10% of all species that
C. studying the fossil record have estimated that the current collection of known fossils accounts for only 10% of all species that
D. who study the fossil record have estimated that the fossils currently collected are only approximately 10% of all species which
E. who study the fossil record estimate that the current collection of known fossils accounts for approximately 10% of all species which

The best/excellent answers get kudos, which will be awarded after the answer is revealed.
There may be no best/excellent answers, or a there may be a few excellent answers!

Official Explanation:

Since the underlined portion of the sentence contains the word approximately, check whether this word is consistent with the rest of the sentence. The words estimated and approximately are both used in the sentence, even though they have similar meanings and only one is needed. This is a redundancy error, so eliminate choice A and look for any obvious repeaters. Choice D is an obvious repeater since it contains the words estimated and approximately, so eliminate choice D. Now evaluate the remaining answer choices individually, looking for reasons to eliminate each.

Choice B fixes the redundancy error by removing approximately, but incorrectly uses the pronoun that (rather than who) to refer to paleontologists, so eliminate choice B. Choice C fixes the original redundancy error by removing the word approximately, and introduces no new errors, so keep choice C. Choice E uses both estimate and approximately, which is redundant, so eliminate choice E.

Choice A: No. The use of both estimated and approximately is redundant. Redundancy.

Choice B: No. The use of that to refer to paleontologists is incorrect. Pronoun agreement.

Choice C: Correct

Choice D: No. The use of both estimated and approximately is redundant. Redundancy.

Choice E: No. The use of both estimate and approximately is redundant. Redundancy.

The correct answer is choice C.
_________________
Simple strategy:
“Once you’ve eliminated the impossible, whatever remains, however improbable, must be the truth.”

GMAT Ninja YouTube! Series 1| GMAT Ninja YouTube! Series 2 | How to Improve GMAT Quant from Q49 to a Perfect Q51 | Time management

My Notes:
Reading comprehension | Critical Reasoning | Absolute Phrases | Subjunctive Mood
Manager
Joined: 11 May 2018
Posts: 125
Location: India
GMAT 1: 460 Q42 V14
Re: Paleontologists studying the fossil record have estimated that the  [#permalink]

### Show Tags

12 Sep 2019, 22:42
someone, please explain why which should be preceded by a comma?
Re: Paleontologists studying the fossil record have estimated that the   [#permalink] 12 Sep 2019, 22:42
Display posts from previous: Sort by