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

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

Please evaluate my reasoning for option A.
I think option A is a weakener.
Because option A gives another reason for CJ's to migrate southward.
Basically this option says is that they don't migrate south because of lack of navigational ability but because they lay their eggs there.
Hence, this kind of works as a weakener.

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

Please evaluate my reasoning for option A.
I think option A is a weakener.
Because option A gives another reason for CJ's to migrate southward.
Basically this option says is that they don't migrate south because of lack of navigational ability but because they lay their eggs there.
Hence, this kind of works as a weakener.

Hello, krndatta. Option (A) could provide a reason for why the Croton's jays migrate southward, but we then have to presuppose that the jays know to follow the crookbeaks for the purpose of parasitic nesting, and such a consideration has little to do with how the jays migrate: whether they do or do not possess sufficient navigational abilities to make their way on their own. I saw you post a fine response in a different thread just a bit ago in which you advised someone to stick to exactly what the passage says. Here, we are aiming to strengthen the argument. If the argument is based on how the jays get from point A to point B, then we should focus on how, not why.

Perhaps that clarifies the matter. Thank you for thinking to follow up with me.

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

Thanks for the praise.
So basically option A is giving us a "why" they migrate south? We are not concerned with the "why".
We have to focus on the "how" part.
Hence, this is a neutral statement.

Am I right?
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Re: Every fall Croton's jays migrate south. The jays always join flocks of [#permalink]
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krndatta wrote:
AndrewN

Thanks for the praise.
So basically option A is giving us a "why" they migrate south? We are not concerned with the "why".
We have to focus on the "how" part.
Hence, this is a neutral statement.

Am I right?

Yes, it does not affect the argument. (I typically avoid one-word tags such as "irrelevant," since I think such a terse treatment of an answer choice does little to explain the thought process behind that word.)

Quote:
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?

Ask yourself a question when you consider the answer choices. Does this information support the idea that the jays lack the navigational ability to [migrate]?

Quote:
(A) Croton's jays lay their eggs in the nests of crookbeaks, which breed upon completing their southern migration.

Again, this information may tell us why the jays follow the crookbeaks, but it provides no insight into the argument itself.

1) The jays lack navigational abilities, so they follow the crookbeaks to lay eggs in their nests.

—OR—

2) The jays do not lack navigational abilities, but they follow the crookbeaks anyway to lay eggs in their nests.

We cannot lean on information in the passage or answer choice to push us into a certain interpretation. Now, I agree that (C) is not the strongest strengthener, but if the jays always seem to migrate in the company of other birds, whether north or south, then the hypothesis that they are not navigationally inclined gains traction (even if it ends up being inaccurate).

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