mammoth's teeth : GMAT Critical Reasoning (CR)
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# mammoth's teeth

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Manager
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24 Mar 2011, 11:06
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Difficulty:

15% (low)

Question Stats:

78% (10:49) correct 22% (01:57) wrong based on 179 sessions

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[Reveal] Spoiler: OA

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Last edited by vjsharma25 on 25 Mar 2011, 10:38, edited 1 time in total.
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24 Mar 2011, 12:04
Evidence:
Adult mammoth teeth from island are 25% smaller than mammoth teeth elsewhere

Conclusion:
mammoths that lived on island are smaller than other mammoths.

Assumption that bridges the gap:
tooth size relative to mammoth size is similar across all groups of mammoths.

To allow the conclusion to be properly drawn, we need to show support for the assumption.

(a) This casts doubt on the assumption.

(b) This is not relevant.

(c) This is not relevant, since we know that the teeth are from adults.

(d) Correct, this strongly supports the Assumption.

(e) Says nothing about size, which is the important factor here.
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24 Mar 2011, 20:15
jko wrote:
Evidence:
Adult mammoth teeth from island are 25% smaller than mammoth teeth elsewhere

Conclusion:
mammoths that lived on island are smaller than other mammoths.

Assumption that bridges the gap:
tooth size relative to mammoth size is similar across all groups of mammoths.

To allow the conclusion to be properly drawn, we need to show support for the assumption.

(a) This casts doubt on the assumption.

(b) This is not relevant.

(c) This is not relevant, since we know that the teeth are from adults.

(d) Correct, this strongly supports the Assumption.

(e) Says nothing about size, which is the important factor here.

Why B is not relevant?
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24 Mar 2011, 20:49
I think the answer should be B
Isn't D redundant, as it is an assumption that the author is already making within the question statement, and is admitting to doing so - 'provided that teeth are representative of their respective populations' Auhtor doesnt need this assumption again, does he?
A and C oppose or negate or contradict what is given in the question statement
isnt B giving an extra reason for teeth size to be small and assuming that this didnt happen in this case? Hence I went with B
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24 Mar 2011, 20:50
we have to somehow link the claim made about teeth size with size of mammoth. choice (B) doesn't do that, rather it goes on talking about tooth wear
(D) fits the gap better in the assumption required

pretty good lsat question, you sure know how to pick the good ones
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25 Mar 2011, 02:54
vivesomnium wrote:
I think the answer should be B
Isn't D redundant, as it is an assumption that the author is already making within the question statement, and is admitting to doing so - 'provided that teeth are representative of their respective populations' Auhtor doesnt need this assumption again, does he?
A and C oppose or negate or contradict what is given in the question statement
isnt B giving an extra reason for teeth size to be small and assuming that this didnt happen in this case? Hence I went with B

D is not redundant, actually, the very fact that it is an assumption that the author made is WHY its the correct answer.

The statement:
'provided that teeth are representative of their respective populations'
Is not the same as:
'provided that teeth are representative of the sizes of their respective populations'

B is a statement about ALL woolly mammoths. All B does is show that the size of the teeth found by the paleontologists is the actual size of the mammoths in each population. This but this still doesn't allow the conclusion to be properly drawn, since we would still need to assume that tooth size is similarly proportionate to mammoth size across all mammoth populations
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25 Mar 2011, 05:52
D here too
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23 Apr 2012, 11:19
For this type of question, i think i have spotted the pattern of choosing the obvious one. I do not think the real gmat is that way though
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25 Dec 2013, 03:47
Initially picked B but realized it is irrelevant. It has no effect on the conclusion upon negation.

D fits well.
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27 Dec 2013, 08:14
jko wrote:
Evidence:
Adult mammoth teeth from island are 25% smaller than mammoth teeth elsewhere

Conclusion:
mammoths that lived on island are smaller than other mammoths.

Assumption that bridges the gap:
tooth size relative to mammoth size is similar across all groups of mammoths.

To allow the conclusion to be properly drawn, we need to show support for the assumption.

(a) This casts doubt on the assumption.

(b) This is not relevant.

(c) This is not relevant, since we know that the teeth are from adults.

(d) Correct, this strongly supports the Assumption.

(e) Says nothing about size, which is the important factor here.

Argument : Paleontologists found 25% smaller size teeth of adult woolly mammoths.
Conclusion : Overall Size of Woolly Mammoths is less than on average compared to the mammoths elsewhere

D) Tooth size among adult woolly mammoths was directly proportional to overall size of those mammoths.
This option is comparing the size among the woolly mammoths.

Whereas in option B) The teeth wear didn't decrease the size of the teeth of adult woolly mammoths significantly.
if negated, the teeth wear did decrease of the teeth size of the woolly mammoths significantly which breaks down the conclusion.

Any pointers?
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27 Dec 2013, 08:44
In my opinion the answer is clearly D.
Re: mammoth's teeth   [#permalink] 27 Dec 2013, 08:44
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