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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25 Aug 2011, 04:32
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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.

Since I'm not a native speaker, I really can't understand the latter part in A "which breed upon completing their southern migration." what does this mean? Appreciated if anyone care to help!!
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Re: CR-prep:Every fall Croton's jays migrate south. [#permalink]

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25 Aug 2011, 06:28
Since I'm not a native speaker, I really can't understand the latter part in A "which breed upon completing their southern migration." what does this mean? Appreciated if anyone care to help!!

It means they reproduce after they have completed their journey. i.e have sex and give birth
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Re: CR-prep:Every fall Croton's jays migrate south. [#permalink]

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25 Aug 2011, 08:12
nammers wrote:
Since I'm not a native speaker, I really can't understand the latter part in A "which breed upon completing their southern migration." what does this mean? Appreciated if anyone care to help!!

It means they reproduce after they have completed their journey. i.e have sex and give birth

Thanks , I got C the first time but this choice really bothers me. I thought breed upon was a phrase here. Now I understand that upon and breed are separate words.

So crookbeaks will breed after migrating to South and Crotons lay their eggs to take advantage of their breeding period. A may explain why they share the same habitat, but still doesn't explain why crotons would wait till another flock comes.
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Re: CR-prep:Every fall Croton's jays migrate south. [#permalink]

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25 Aug 2011, 08:34
C talks about Tattersall warblers...which is not even mentioned in the passage...

pls help understand how did you choose C
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Re: CR-prep:Every fall Croton's jays migrate south. [#permalink]

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25 Aug 2011, 10:49
DeeptiM wrote:
C talks about Tattersall warblers...which is not even mentioned in the passage...

pls help understand how did you choose C

A term, noun or a premise can be introduced from outside in case of weaken and strengthen type questions. C strengthens the author's conclusion that Croton's jays lack navigational skill to travel south by showing that they don't need crookbeaks for anything else except for the navigation. The hint is provided by showing that Croton's jays follow another species altogether to travel north because they also take them to their destination. The only concern I had was the word "north"; the argument talks about south. However, if we just generalize the conclusion by saying that the jays lack migrating navigation skill altogether, C fits in.

"A" weakens the argument by showing an alternate reason for tailgating. It says; no-no, jays follow crookbeaks because they need a place to usher their eggs, not because they need navigation.

"B" talks about a completely out of scope fact. Croton jays are not even mentioned.

"D" doesn't say anything about Croton's jays. We need to know whether jays need navigation and here's "D", talking about other species that don't concern the problem in hand.

"E" says crookbeaks migrate north in spring. Conclusion is about the lacking navigational skill to travel South. At best, it actually weakens the argument by suggesting that jays will travel north without crookbeaks help. But, who knows if they have some other buddies who can help them get to north; someone like Tattersall warblers. However, we shouldn't assume that.

Ans: "C"
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Re: CR-prep:Every fall Croton's jays migrate south. [#permalink]

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25 Aug 2011, 11:34
Here we need to strengthen the conclusion that " Jays lack the navigational ability to find their way to the south".

Option C directly supporting the conclusion by stating that jays depend on another species warbler to migrate migrate north
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Re: CR-prep:Every fall Croton's jays migrate south. [#permalink]

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29 Aug 2011, 00:54
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sleepysnowy wrote:
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.- Does it work in any way to strengthen ?
B. The three species most closely related to crookbeaks do not migrate at all.-So what ? does not convey the message, at best left us more confusecd!
C. In the spring, Croton's jays migrate north in the company of Tattersall warblers.- This some ways shows it requires some ones else company to move around- so proabable, keep it
D. Species other than Croton's jays occasionally accompany flocks of migrating crookbeaks.- we are not looking for anything other than C Jay's or are we ?
E. In the spring, crookbeaks migrate north before Croton's jays do.- same reason as D

Since I'm not a native speaker, I really can't understand the latter part in A "which breed upon completing their southern migration." what does this mean? Appreciated if anyone care to help!! - crookbeaks do breeding after migrtaing to south. Anyways this was not any issue I guess while solving the question

So C seems to be the best available option!
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Re: CR-prep:Every fall Croton's jays migrate south. [#permalink]

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29 Aug 2011, 02:04
Clearly C, it is the only solution that strengthens the argument.
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Re: Every fall Croton's jays migrate south. The jays always join [#permalink]

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22 May 2012, 12:45
i got this on the second gprep test. I answered E because this shows that it is indeed crookbeaks who dont need directions. Although C could imply that jays may not need directions but need company, Again since they were talking about northbound flight i ignored this option.

I guess i was wrong! but this question doesnt seem convincing
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Re: Every fall Croton's jays migrate south. The jays always join [#permalink]

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22 May 2012, 20:05
In the arguement it is mentioned that Jay's fly with crookbeaks when migrating south. When Jay's are left behind for any reasons, they wander till they find another flock of Crrokbeaks that are migrating south.

Option C talks about how Jay's accompany Tattersall warblers while migrating north.

Hence it can be said that Jay's lack navigational skills.
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Re: Every fall Croton's jays migrate south. The jays always join [#permalink]

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10 Sep 2014, 07:32
If the conclusion contains a generalization, then a possible strengthener will show another instance in which the generalization holds true. A weakener, on the other hand, will show another instance in which the generalization does not hold true. Hence (C) is the right answer.
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Every fall Croton's jays migrate south. The jays always join [#permalink]

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29 Aug 2016, 12:50
Option C never says about south and is not a good contender for answer. It does not give thought whether Jays cannot travel to south with out help.

Option E says Crookbeaks travel with out Jays, means Jays may or may not require some one to take them to North but they require some one to take to South.

Not able to understand how Option C is better than Option E.
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Every fall Croton's jays migrate south. The jays always join [#permalink]

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30 Aug 2016, 11:11
ravikrishna1979 wrote:
Option C never says about south and is not a good contender for answer. It does not give thought whether Jays cannot travel to south with out help.

Option E says Crookbeaks travel with out Jays, means Jays may or may not require some one to take them to North but they require some one to take to South.

Not able to understand how Option C is better than Option E.

E. In the spring, crookbeaks migrate north before Croton's jays do.

If crookbeaks migrate before Crotons , we cannot state whether Croton will reach their destination/not, hence this doesn't strengthen the conclusion...

To strengthen the conclusion " Croton's jays lack the navigational ability to find their way south on their own." we need a statement to show that the Crotons are dependent on the crookbeaks for navigation/migration and only (C) does it perfectly.
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Re: Every fall Croton's jays migrate south. The jays always join [#permalink]

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07 Jan 2017, 05:52
To prove : Croton's jays lack the navigational ability to find their way south on their own.

As mentioned in the passage, Croton's jay is dependent on crookbeaks for migration to south.
If we are able to find some clue which suggests that the Croton's jay needs the same kind of help in migration, then that will help to strengthen the argument.
option (C) suggests the same.

Ans : C
Re: Every fall Croton's jays migrate south. The jays always join   [#permalink] 07 Jan 2017, 05:52
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