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Every fall Croton's jays migrate south. The jays always join flocks of

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

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Every fall Croton's jays migrate south. The jays always join flocks of migrating crookbeaks with which they share the same 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 nests of crookbeaks, which breed upon completing their southern migration.

(B) The three species 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

Last edited by hazelnut on 30 Sep 2017, 19:19, edited 1 time in total.
Edited the question.

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

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New post 17 Feb 2009, 02:13
C seems to be the only possible solution. Hmm.

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

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New post 17 Feb 2009, 09:02
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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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 17 Feb 2009, 09:56
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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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 17 Feb 2009, 11:01
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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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 17 Feb 2009, 11:06
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AndersonBound wrote:
Quote:
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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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 28 Dec 2009, 14:01
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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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 28 Dec 2009, 15:13
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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. :lol:
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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 28 Dec 2009, 19:08
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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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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 29 Dec 2009, 15:55
IMO C.
Since Crotons club with other birds to navigate north, they do not have a sense of direction
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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 30 Dec 2009, 06:39
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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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 11 Jan 2010, 14:24
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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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 23 Feb 2010, 06:08
Strenthning leadership of CB does not necessarly leads to argument that CJ lacks navigation ability.

Option C further strenthens the argument that CJ is weak for its navigation ability.

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

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New post 08 Jun 2010, 06:20
IMO A.

The entire argument is on migration to South and even the last concluding statement says so - Croton's jays lack the navigational ability to find their way south on their own.


How can C be correct OA? I think this is a SHELL GAME Fallacy. It is talking abt North while we need to strengthen the Southern migration.

If the conclusion says - Croton's jays lack the navigational ability to find their way, then C would be correct.

Any more reasoning?

AndersonBound wrote:
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?

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

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New post 31 Aug 2010, 04:42
So we are down to C and E by POE.
Choice E does not strengthen because it is just stating that the crookbeaks leave before the Jays. It does not mean that the jays follow them soon after, or at all. That will be assuming too much...which is what the question wants us to do
Choice C strengthen since we now know that the jays follow the Crookbreak to the south and then follow the warbler on the way back. So they could be lacking the navigational skill. We can also see that the information are more specific compared to (E)

If we able to eliminate choice E, then that will leave just C


p/s: birds that migrate do migrate in both directions. Example, birds in the cold,northern climate would go south for winter and then come back for spring/summer when the weather is warmer..it is fun to watch...

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

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New post 04 Jan 2011, 15:48
AndersonBound wrote:
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.
-->irrelevant, does not strengthen or weaken
B - The three species of most closely related to crookbeaks do not migrate at all.
-->irrelevant information
C - In the spring, Croton's jays migrate north in the company of Tattersall warblers.
-->this looks promising...in the fall CJ's fly with crookbeaks because their navigation is weak and in the spring they fly with other birds because they may also need help
D - Species other than Croton's jays occasionally accompany flocks of migrating crookbeaks.
-->additional information but not what we are looking for
E - In the spring, crookbeaks migrate north before Croton's jays do.
-->weakens the argument, if crookbeaks migrate north before CJ's then the crookbeaks are not more superior at navigating but just may have a head start
[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?



I burned 2 min 20 sec on this one but came up with the right choice C.
We are looking to strengthen this argument so we need to strengthen the statement that Croton Jay's are bad at navigating so they need to rely on others to get to the right location.
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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 04 Jan 2011, 22:45
option C. its crystal clearly stated in the statement that C - In the spring, Croton's jays migrate north in the company of Tattersall warblers. so they lacks the Navigation ability.
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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 05 Jan 2011, 21:35
C is correct but it is not conclusive. The fact that they travel both directions with two different species suggests that navigation is the reason. The reason could also be a symbiotic relationship between the two but we do not have info on the survival habits of the two different accompanying species. The chance/probability that the two species would help the crotons jays in the same manner other than navigationally is halved in C thereby somewhat strengthening the original statement---Catch my drift? :-D The key word is "strengthens" ie not conclusive but very suggestive. (A)is definitely not the answer. --I am not sure where the reasoning is coming from (shell game fallacy???---how does that come into play???). These questions are often simple and straightforward reread the question and do not try to overthink it.

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

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New post 10 Jan 2011, 02:17
AndersonBound wrote:
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.=> irrelevant, the argument is about navigational ability, not about the eggs laying.
B - The three species of most closely related to crookbeaks do not migrate at all.=> irrelevant, there is no detail in the argument concerning the other 3 species.
C - In the spring, Croton's jays migrate north in the company of Tattersall warblers.=> this is correct. Because the Croton's Jays lack the navigational ability, they need the warblers to help them.
D - Species other than Croton's jays occasionally accompany flocks of migrating crookbeaks.=> like B
E - In the spring, crookbeaks migrate north before Croton's jays do.=> irrelevant, this answer does not strengthen the argument.

[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?


The C is the best answer among the answers given, but it is not the most ideal answer in the world. This one is tricky. But POE is useful here, it took me one and half of a minute
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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]

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New post 07 Feb 2011, 10:21
A >> Irrelevant for the most
B >> Irrelevant. If analysed, somewhat strengthens the conclusion
D >> Weakens the conclusion
E >> Weakens the conclusion

C is the best fit as it directly relates to migratory instincts of the bird.
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Re: Every fall Croton's jays migrate south. The jays always join flocks of   [#permalink] 07 Feb 2011, 10:21

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