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# Guillemots are birds of Arctic regions. They feed on fish

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Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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02 Sep 2010, 11:55
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Question Stats:

60% (02:34) correct 40% (02:08) wrong based on 111 sessions

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Guillemots are birds of Arctic regions. They feed on fish that gather beneath thin sheets of floating ice, and they nest on
nearby land. Guillemots need 80 consecutive snow-free days in a year to raise their chicks, so until average temperatures
in the Arctic began to rise recently, the guillemots’ range was limited to the southernmost Arctic coast. Therefore, if the
warming continues, the guillemots’ range will probably be enlarged by being extended northward along the coast.

Which of the following, if true, most seriously weakens the argument?

(A) Even if the warming trend continues, there will still be years in which guillemot chicks are killed by an unusually
early snow.
(B) If the Arctic warming continues, guillemots’ current predators are likely to succeed in extending their own range
farther north.
(C) Guillemots nest in coastal areas, where temperatures are generally higher than in inland areas.
(D) If the Arctic warming continues, much of the thin ice in the southern Arctic will disappear.
(E) The fish that guillemots eat are currently preyed on by a wider variety of predators in the southernmost Arctic
regions than they are farther north.

[Reveal] Spoiler:
The OA is D, but I don't understand why it's not B. The argument is that the guillemots will start living further north as the weather continues to get warmer. (D) states that if the warming continues, the thin ice in the south will disappear. This would mean that the birds could not stay in the south - suggesting that they would move north to find new food. This seems like it strengthens the argument, not weakens it. (B) says that if the warming continues, the birds' natural predators will move north, which seems to me would help keep the birds from moving north. That would weaken the argument that the birds are going to move north. Why isn't it (B)?
[Reveal] Spoiler: OA

Last edited by TehJay on 03 Sep 2010, 10:38, edited 1 time in total.
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02 Sep 2010, 21:37
I go with D here.....Its given that birds feed on the fish that gather beneath the ice => they need the ice to stand on to feed the fish. If the ice in the southern arctic disappear, the birds population in the southern region would dwindle, but the premise says "the guillemots’ range will probably be enlarged by being extended northward"....which means the population should extend towards north not just move towards north!
Hope its clear!!
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02 Sep 2010, 23:33
D it is. Great question. B clearly says that the predators extend the range and it means the range did extend.
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03 Sep 2010, 01:01
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I remember those peculiar birds, there was another discussion earlier - og-diagnostic-89799.html
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03 Sep 2010, 02:08
D seems right
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03 Sep 2010, 04:47
I also selected D with the same thinking as Psychomath. But OA is B.
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03 Sep 2010, 06:15
psychomath wrote:
I go with D here.....Its given that birds feed on the fish that gather beneath the ice => they need the ice to stand on to feed the fish. If the ice in the southern arctic disappear, the birds population in the southern region would dwindle, but the premise says "the guillemots’ range will probably be enlarged by being extended northward"....which means the population should extend towards north not just move towards north!
Hope its clear!!

But that means you're picking (D) because it AGREES with the argument that they'll be extending north - they need to go north to find more food! The question is asking for a choice that will WEAKEN the argument that they'll be extending north...
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03 Sep 2010, 09:53
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No TehJay, psychomatch is right. The answer should be D because the paragraph says the birds range will be increased as the warming temperature means they can continue to live in the south as well as go further up north. so the total area they live in will be increased. But according to D, as it warms up, the south will no longer have the thin ice where the bird's food (the fish) can be found. So the birds will no longer stay in the south, and maybe move up north, so the total area they live in is not necessarily increased. I hope this is clearer.
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03 Sep 2010, 09:54
dkverma wrote:
I also selected D with the same thinking as Psychomath. But OA is B.

I think there was a mistake in the post by TehJay. The official answer is D, not B. Refer to the first spoiler section by TehJay where he/she describes that he/she thought the answer was B but the official answer was D.
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03 Sep 2010, 10:40
hetalcs wrote:
No TehJay, psychomatch is right. The answer should be D because the paragraph says the birds range will be increased as the warming temperature means they can continue to live in the south as well as go further up north. so the total area they live in will be increased. But according to D, as it warms up, the south will no longer have the thin ice where the bird's food (the fish) can be found. So the birds will no longer stay in the south, and maybe move up north, so the total area they live in is not necessarily increased. I hope this is clearer.

Wow, that is really tricky. I didn't interpret the passage in that way at all. Thanks!

Sorry about the mistake in the original post, I edited in the correct OA.
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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15 Feb 2016, 07:09
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Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Guillemots are birds of Arctic regions. They feed on fish   [#permalink] 15 Feb 2016, 07:09
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