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Fossils of the arm of a sloth found in Puerto Rico in 1991,

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Q28: Fossils of the arm of a sloth found in Puerto Rico in [#permalink]

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Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.

A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of

B. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on

C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of

D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on

E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
[Reveal] Spoiler: OA

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Last edited by nguyendinhtuong on 30 May 2017, 02:53, edited 2 times in total.
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Re: Q28: Fossils of the arm of a sloth found in Puerto Rico in [#permalink]

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New post 10 Oct 2005, 14:58
I go with D

"mammal on the Island" sounds right to me.

'earliest known human of the earth' & 'earliest known human on the earth'
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Re: Q28: Fossils of the arm of a sloth found in Puerto Rico in [#permalink]

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nakib77 wrote:
Q28:
Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
B. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of


B,C,E out due to the S-V disagreement: fossils is a plural noun, thus it must be followed by a plural verb.
A is out with the wrong tense of "dated" ( it should be present perfect as the fact continues to the present.) . Besides, the use of "of" is wrong, "the earliest known mammal" must be the earliest of the same kind of thing, "islands" is not the same kind to " mammal".

D it is!
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Re: Q28: Fossils of the arm of a sloth found in Puerto Rico in [#permalink]

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A. 'and dated at 34 million years old' is wrong. it suggests the actin of dating it is simultaneous with the act of discovering it

B. - 'they' has no clear referent

C. - 'of the island' is not idiomatic

D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on

E. - awkward sentence

D is the best choice.
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Re: Q28: Fossils of the arm of a sloth found in Puerto Rico in [#permalink]

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New post 10 Oct 2005, 20:45
D is best.

In A, "made it" is an awakward position. "has" in B, and "was" in C and E are wrong verbs. the shubect is fossils is the subject so needs plural verb. Remains D, which has proper verb with proper modifying phrase "making the sloth the earliest known mammal on".
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Re: Q28: Fossils of the arm of a sloth found in Puerto Rico in [#permalink]

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New post 11 Oct 2005, 11:25
D for subject-verb agreement and for properly referring the sloth to the mammal.

nakib77 wrote:
Q28:
Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
B. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
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Re: Q28: Fossils of the arm of a sloth found in Puerto Rico in [#permalink]

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New post 11 Oct 2005, 13:26
Good job guys.... OA is indeed D.
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Fossils of the arm of a sloth found in Puerto Rico in 1991, [#permalink]

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Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
B. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
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Re: SC - Sloth [#permalink]

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New post 15 Apr 2009, 05:09
IMO E

Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of --> this answer incorrectly means the sloth, not the fossil, was found in Puerto Rico in 1991
B. sloth, that they found in Puerto Rico in 1991, [color=#000000]has[/color] been dated at 34 million years old, thus making it the earliest mammal known on --> many problems: wrong verb tense, same error as (A) and thus is needless here
C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of --> also the same errors as (A) & (B)
D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on --> this answer wrongly mean the fossil, not the sloth, is 34 million years old. Besides, on is unidiomatic
E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of[/quote] --> correct meaning, precise clause, idiomatic phrase, best choice
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Re: SC - Sloth [#permalink]

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New post 15 Apr 2009, 09:02
I feel A.
Though I dint like any other choice including this one.

Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of-- here it refers to Sloth
B. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on--> use of they
C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of---> Fossils is plural
D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on--> have been
E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of--> found in Puerto Rico in 1991 is wrongly placed and you cannot date sloth
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Re: SC - Sloth [#permalink]

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New post 17 Apr 2009, 20:28
bandit wrote:
Minheequang wrote:
IMO E

Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of --> this answer incorrectly means the sloth, not the fossil, was found in Puerto Rico in 1991
B. sloth, that they found in Puerto Rico in 1991, [color=#000000]has[/color] been dated at 34 million years old, thus making it the earliest mammal known on --> many problems: wrong verb tense, same error as (A) and thus is needless here
C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of --> also the same errors as (A) & (B)
D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on --> this answer wrongly mean the fossil, not the sloth, is 34 million years old. Besides, on is unidiomatic
E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of --> correct meaning, precise clause, idiomatic phrase, best choice
Fossils ...was is not correct here.


Was is correct because it is the verb for subject sloth, not fossils. Check it again, you will see that which stands behind sloth, beginning a new clause "which was dated at 34 million years old". Hence, this clause will modify for sloth, not for any other noun

However, I re-check my answer and think that the correct ans is most likely (D), not (E) as in my first post. The reason is that the particple phrase standing between the 2 commas found in puerto Rico in 1991 is most likely modified for sloth, not for fossils, so it is incorrect
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Re: SC - Sloth [#permalink]

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This question can be found in the GMAT Review, 12th Edition. It is question number 78, and can be found on pages 672 and 724, the latter containing the OA. The correct answer is D.
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Re: SC - Sloth [#permalink]

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New post 19 Aug 2010, 21:21
OA is D...I am looking at Prep 2's answer. I chose A

from my analysis I would say it is because fossils are the subject not the sloth. Also fossils is plural so you cant use "it" ... if you use it then you would be saying that the arm of the sloth is the earliest known mammal right?
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Re: SC - Sloth [#permalink]

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To me, D is clear. I am also astonished to see soo many Cs.
While in C, "sloth that was found " if we are using that clause to refer to fossils (which in this case we are actually !! ) was have to be were !!!
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Re: SC - Sloth [#permalink]

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Let us first clear up a few things. This is not a test of the usage of ‘which’ or ‘that’. GMAT doesn’t test that aspect any more as it would not like to indulge in this controversial usage.

This is a clearly test of SV agreement, tense and idiom. What is the verb and what is its subject? Made is the verb and what made it the earliest mammals? The fossils made it (it stands for the sloth) because only fossils are dated and not any other thing. So the subject is the plural fossils and let us find the matching verb with a proper number and tense.


A. Sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of …. ‘Made it’ is wrong tense to use for something that was initiated in the past, and which remains even today so. The right tense should be the present perfect ‘have made’. Mammals of is unidiomatic


B. sloth that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on … Fossils …. Has been dated – S-V mis - match.

C. sloth that was found in Puerto Rico in 1991 was dated at 34 million years old, making this the earliest known mammal of …… Fossils … was dated –S-V mis-match and use of past tense which is wrong.

D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on……. Correct number agreement, proper tense usage and right idiom – the perfect choice

E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of….. Fossils was dated SV mis - match , wrong tense and wrong idiom
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Re: Fossils of the arm of a sloth found in Puerto Rico in 1991, [#permalink]

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Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years
old, made it the earliest known mammal of
the Greater Antilles islands.

A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
Do not use a comma before "AND" to separate two verbs that have same subject. Either eliminate the comma or add subject to the second verb, ( fossils were dated) creating a second main clause. Here subject is Fossils and two verbs are found and dated.

B. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
Fossils of the arm of sloth-->plural. "has been dated at 34 million years old"-->singular. Eliminate

C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
Fossils of the arm of sloth-->plural. "was dated at 34 million years old"-->singular. Eliminate

D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
Fossils of the arm of sloth-->plural. "have been dated at 34 million years old"-->plural. Correct

E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
, found in Puerto Rico in 1991, --> non-essential modifier whereas essential modifier is required.
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Re: SC - Sloth [#permalink]

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New post 03 Sep 2011, 05:37
Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.

A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
- the sentence is correct on the subject - verb agreement front. however, 'it' is ambiguous here in that sloth is not the subject of the sentence. it is object of the preposition. though it CAN act as an antecedent, a choice that replaces the pronoun with the sloth would be better.
B. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
- subject and verb do not agree. The subject is fossils, verb has is incorrect. also, this choice is wordy.

C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of - subject verb agreement. Fossils was is incorrect. also, this pronoun cannot be used as a noun. it can be used as an adjective only. the correct use would be making it or making this sloth.

D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on - this choice is correct, subject and verb agree. and the sloth is introduced in place of the pronoun.

E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of - subject verb agreement issue, was dated is incorrect. introducing the sloth in place of the pronoun removes pronoun ambiguity though.
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Re: Q28: Fossils of the arm of a sloth found in Puerto Rico in [#permalink]

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New post 19 Feb 2013, 03:00
nakib77 wrote:
Q28:
Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
B. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of



A is awkward. Fossils made it the earliest known mammal. It is the action of being dated as 34 m years old that made it as such.
B uses pronoun they which refers to none in the sentence.
C that was found is wordy and "making this" is awkward which is obviously not better than D.
E has which and modifiers misplaced. D is better.

Answer: D
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Re: Q28: Fossils of the arm of a sloth found in Puerto Rico in [#permalink]

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New post 14 Sep 2013, 21:03
This is OG13 Q81

Fossils is Plural, hence B C and E can be eliminated immediately subject verb agreement issue.

D seems to be correct, But can some faculty give in depth explanation WHY A is wrong D is correct.
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Re: Q28: Fossils of the arm of a sloth found in Puerto Rico in [#permalink]

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honchos wrote:
This is OG13 Q81

Fossils is Plural, hence B C and E can be eliminated immediately subject verb agreement issue.

D seems to be correct, But can some faculty give in depth explanation WHY A is wrong D is correct.


Hi honchos.

A is wrong because of the comma.

A) Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
The green part is modifier that should be blocked off both sides by commas. However, there is only a comma on the right, not on the left. Grammatically, this is wrong structure.

D). sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
The modifier is blocked off perfectly both sides by two commas. Hence, D is a correct sentence.

Hope it's clear.
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Re: Q28: Fossils of the arm of a sloth found in Puerto Rico in   [#permalink] 14 Sep 2013, 23:13

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