Every fall Croton's jays migrate south. The jays always join : GMAT Critical Reasoning (CR)
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# Every fall Croton's jays migrate south. The jays always join

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Every fall Croton's jays migrate south. The jays always join [#permalink]

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16 Feb 2009, 23:36
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Every fall Croton's jays migrate south. The jays always join flocks of migrating crookbeaks with which they share the summer and winter territories. If a jay becomes separated from the crookbeaks it is accompanying, it wanders until it comes across another flock of crookbeaks. Clearly, therefore, Croton's jays lack the navigational ability to find their way south on their own.

Which of the following, if true, most strengthens the argument above?
A - Croton's jays lay their eggs in the nest of crookbeaks, which breed upon completing their southern migration.
B - The three species of most closely related to crookbeaks do not migrate at all.
C - In the spring, Croton's jays migrate north in the company of Tattersall warblers.
D - Species other than Croton's jays occasionally accompany flocks of migrating crookbeaks.
E - In the spring, crookbeaks migrate north before Croton's jays do.

[Reveal] Spoiler: OA
C

Not a clue for the rhyme or reason why the OA is what it is. Anyone care to shed some light?
[Reveal] Spoiler: OA
If you have any questions
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28 Dec 2009, 18:08
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Here is why the answer is C.

The premise they want us to strengthen is that these C Jay birds lack the ability to find their way on their own. C is the only one that strengthes this premise.

C says (C) In the spring, Croton’s jays migrate north in the company of Tattersall warblers.

If these birds also migrate following another type of bird this supports the premise that they cannot find the way on their own.

The reason it is not A is because -

A says Croton’s jays lay their eggs in the nest of crookbeaks, which breed upon completing their southern migration. Well, this provides a different reason as to why they would follow the crookbreaks. They might be following them because they are waiting for their young to be born, not because they lack the navigational ability to find their way south on their own.

The reason it is not B is because -
B says B) The three species of most closely related to crookbeaks do not migrate at all

This is irelevant and has nothing to do with the argument.

The reason it is not D is because -

D says, (D) Species other than Croton’s jays occasionally accompany flocks of migrating crookbeaks.

This statement does not strengthen the premise that Croton Jays' can't follow directions. It actually weaknes that premise because it shows that other birds also follow these birds, so it is not a specific condition for the the C Jays.

E is not the answer, because it is not relevant to the question

I hope these help explanations help!
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17 Feb 2009, 10:06
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AndersonBound wrote:
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In the spring, crookbeaks migrate north before Croton's jays do.

Wouldn't E indicate that CJs follow CB up north?

Before does not signify whether they are in the vision of CJ's to follow.

If they migrate a month before, CJ cannot see the CB, unless CB moves an inch a day.

if they migrate 10 min before, CJ possibly can see CB in the air and follow them for navigation.

Also the Q is clearly about moving together. not before/behind.
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28 Dec 2009, 14:13
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I narrowed it down to C and D, and picked C based on the assumption that the jays always need someone to migrate with, hence,

Conclusion: The jays can't navigate south on their own.
Evidence: Share migration with crookbeaks, if jay is lost :: jay finds crookbeaks
Assumption: The jays always migrate with birds of a differing species.

Not sure if this is entirely the correct reasoning...guess I would've been a little lucky.
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16 Feb 2009, 23:53

I would probably pick C, uncomfortably.
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17 Feb 2009, 01:13
C seems to be the only possible solution. Hmm.
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17 Feb 2009, 02:43
A is the best
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17 Feb 2009, 08:02
I'll go with C

IMO, this option shows that for migrating in any(north or south) direction they need guidance

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17 Feb 2009, 08:56
Got C as well.

Only answer that says CJ needs company to go any where. Probably because they cant navigate by themselves.

OA & OE?
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17 Feb 2009, 10:01
Quote:
In the spring, crookbeaks migrate north before Croton's jays do.

Wouldn't E indicate that CJs follow CB up north?
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17 Feb 2009, 10:28
^^Thanks for clarifying. Your explanation helped burn the fog away.

OA: C
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28 Dec 2009, 08:00
AndersonBound wrote:
^^Thanks for clarifying. Your explanation helped burn the fog away.

OA: C

Picked C..lesser of all the other evils...
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28 Dec 2009, 08:49
I picked A. can anybody explain what wrong with it. May be the eggs hatch and give birth to young ones who dont know the navigation. [:P]
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28 Dec 2009, 13:01
In the question it is mentioned that they cant travel to south on their own and to support this why we have to use the statement which suggest that they cant travel to north on their own???

I still not get it why the answer is C I think it should be A. Please can some one explain in detail?
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29 Dec 2009, 07:39
Good explanation....
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29 Dec 2009, 14:55
IMO C.
Since Crotons club with other birds to navigate north, they do not have a sense of direction
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30 Dec 2009, 05:39
Its a clear C... they need navigation
so to strengthen, they need a navigator, in spring other birds provide the navigation
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11 Jan 2010, 13:24
Well, think of this: if CJ do not follow CB when migrating north and follow another species instead, how would CJ find CB to share the north habitation areal with? Thus, C weakens the statement.
The right answer is D: it emphasizes the leadership of CB among the migrating species.

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23 Feb 2010, 05:08

Option C further strenthens the argument that CJ is weak for its navigation ability.
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26 Feb 2010, 11:54
C
Re: CR, Croton's Jays   [#permalink] 26 Feb 2010, 11:54

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