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

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Re: CR, Croton's Jays [#permalink] New post 08 Jun 2010, 05:20
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: CR, Croton's Jays [#permalink] New post 31 Aug 2010, 03:42
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: CR, Croton's Jays [#permalink] New post 01 Sep 2010, 01:59
Yes only is the choice however it is not absolute... but as they say... it is best among others
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Re: CR, Croton's Jays [#permalink] New post 04 Jan 2011, 06:01
source pls ?
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Re: CR, Croton's Jays [#permalink] New post 04 Jan 2011, 07:58
c
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Re: CR, Croton's Jays [#permalink] New post 04 Jan 2011, 10:24
C. thanks for the question.
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Re: CR, Croton's Jays [#permalink] New post 04 Jan 2011, 14:48
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: CR, Croton's Jays [#permalink] New post 04 Jan 2011, 21:45
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: CR, Croton's Jays [#permalink] New post 05 Jan 2011, 20:35
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: CR, Croton's Jays [#permalink] New post 09 Jan 2011, 01:18
C is perfect
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Re: CR, Croton's Jays [#permalink] New post 10 Jan 2011, 01:17
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: CR, Croton's Jays [#permalink] New post 07 Feb 2011, 09:21
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: CR, Croton's Jays [#permalink] New post 07 Feb 2011, 09:26
Except C, other choices either stay neutral to or weaken the argument.
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Re: CR, Croton's Jays [#permalink] New post 09 Feb 2011, 03:43
C is the best. C strengthens the conclusion that Croton's jays lack navigational skills.
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Re: CR, Croton's Jays [#permalink] New post 17 Mar 2011, 16:30
This was hard! especially on the test- i zeroed in on C and E

- 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.

I chose E because this shows that crookbeaks dont join Crotons and the case is reverse as stated. But this is already obvious from the mention of the lost croton wandering around. Hence C by elimination! nasty
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Re: CR, Croton's Jays [#permalink] New post 19 Mar 2011, 04:19
Should be C.

What needs to be strengthened is "Croton's jays lack the navigational ability to find their way south on their own"

Only option C does that
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Re: CR, Croton's Jays [#permalink] New post 14 Apr 2011, 12:32
C !
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Re: CR, Croton's Jays [#permalink] New post 25 May 2011, 07:28
No reasoning gap therefore calls for defender answer choice usage.

C does the trick.
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Re: CR, Croton's Jays [#permalink] New post 25 May 2011, 09:10
Doesn't the conclusion of this argument state that "Croton's jays lack the navigational ability to find their way SOUTH on their own"?. Option C verifies that they lack navigational ability but not specifically while heading south. I would have chosen option E becuase it rectifies that the jays need help only going south since they are able to fly north on their own.
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Re: Every fall Croton's jays migrate south. The jays always join [#permalink] New post 07 Jan 2012, 16:12
C. Process of elimination although I think this question is difficult because C doesn't make complete sense either. I was looking for an answer with jays in general, not Croton's jays.
Re: Every fall Croton's jays migrate south. The jays always join   [#permalink] 07 Jan 2012, 16:12
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