Guillemots are birds of Arctic regions. They feed on fish : GMAT Critical Reasoning (CR)
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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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28 Jan 2010, 12:32
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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: OA

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

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28 Jan 2010, 13:44
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(D) If the Arctic warming continues, much of the thin ice in the southern Arctic will disappear.

If these birds prey on special kind of fish, it's logical to assume, that without this fish guillemots won't be able to maintain current habitat.

So, if thin ice in southern arctics disappears guillemots will be forced to move north. It won't be the enlargement of guillemots' range, rather simply movement to better place.
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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28 Jan 2010, 22:39
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B

gullimots predators will move north which weakens the conclusion I think.
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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07 Feb 2010, 11:14
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pjalan wrote:
B

gullimots predators will move north which weakens the conclusion I think.

between B & D, latter looks more correct as B says about extension of range of guillemots' predator but that doesn't weaken the conclusion as the argument in D. Spreading of predators will be a deterrent but if there is no food available in the southern coast they are bound to move northwards, daring the predator.

Whereas D is a better answer since it clearly refutes the concept of enlargement and imposes the idea that their dewelling has to move northwards due to lack of availability of food in south.

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

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08 Feb 2010, 05:32
if the thin ice over sounthern Arctic dissapears,why would the birds even try to expand their range along the north
D wins
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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10 Feb 2010, 07:34
my bet is C.
(C) if the birds stay in coastal region, they might still prefer staying south, because there will be even more snow-free days.

I considered A and B as well.
(A) It requires a little too much to assume. Warmer temp would bring more snow-less days, but there is no hint about an early snow.

(B) if the predators move north, birds are not gonna like it and might hesitate moving. But it is the interdependent thing, which bothers me here.

(D) not because, the birds eat on fish, which hide beneath those sheets. If that disappears, they'd definitely move north.
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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12 Feb 2010, 20:09
IMO B

what is OA?
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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14 Feb 2010, 18:11
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Hey All,

Enough questions enough that I figured it might be worth my weighing in. As any good instructor would, I'm going to focus on the passage first.

Conclusion: Warming will extend Guillemots range north

Premises: Guillemots feed on fish beneath ice, nesting nearby. Need snow-free area to raise chicks. Area is warming, particularly north.

Assumption: Something other than the warming will keep them from extending range.

We know the assumption will be this limited, because otherwise the argument is solid (i.e. if the warm area is expanding, and they can live in warm weather, then obviously their range will expand).

(A) Even if the warming trend continues, there will still be years in which guillemot chicks are killed by an unusually early snow.
Problem: This has no connection to the issue of range, because this would happen anywhere.

(B) If the Arctic warming continues, guillemots’ current predators are likely to succeed in extending their own range farther north.
Problem: In a number of answer choices here, the question is trying to trick you into thinking that the conclusion is that the guillemots will THRIVE in the new areas. But that's not the conclusion. The conclusion is merely that the range of areas in which they can survive will expand. This has no effect on that. The same predators joining them in the new area will result in much the same lifestyle the guillemots already have (same predators).

(C) Guillemots nest in coastal areas, where temperatures are generally higher than in inland areas.
Problem: This doesn't affect the conclusion, which is that the increasing temperatures ELSEWHERE will expand the range of the guillemots.

(D) If the Arctic warming continues, much of the thin ice in the southern Arctic will disappear.
Answer: This one may look out of scope, but remember that scope isn't really an issue on strengthen/weaken questions; you're allowed to bring in other information. If the thin ice disappears, then the guillemots will not be able to expand their habitat, because they survive on the fish that live under the ice. This relates to their ability to expand. To contrast with B, the predators are THE SAME in the new area or the old. In D, the food source is DIFFERENT (worse) in the new area, which weakens the conclusion.

(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.
Problem: This actually strengthens the argument, because the guillemots are planning to move north. fewer predators means a better chance of succeeding.

Hope that helps!
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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29 Apr 2011, 07:40
i got this one wrong . the question is trying to trick ... and the wording is vague.
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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29 Apr 2011, 07:57
Tussle between B and D. Actually went for B since I interpreted that since predators will be at the northern part the birds won't move there.But thats too much of assumption. Hence wrong.
OA should be D.
Great question.
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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18 Jan 2012, 06:53
I understand (D) perfectly. But can someone please explain why fish under the ice will disappear because of melting ice?

Quote:
Answer: This one may look out of scope, but remember that scope isn't really an issue on strengthen/weaken questions; you're allowed to bring in other information. If the thin ice disappears, then the guillemots will not be able to expand their habitat, because they survive on the fish that live under the ice. This relates to their ability to expand. To contrast with B, the predators are THE SAME in the new area or the old. In D, the food source is DIFFERENT (worse) in the new area, which weakens the conclusion

We have to assume that fish needs ice in order to survive. But that's just another assumption.
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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11 Aug 2013, 02:50
What would be the difficulty level of this question I picked B...
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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21 Mar 2014, 01:53
fozzzy wrote:
What would be the difficulty level of this question I picked B...

The difficulty level of the question is "Devilish" according to MGMAT OG Archer Lite
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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01 May 2015, 06:27
nonameee wrote:
I understand (D) perfectly. But can someone please explain why fish under the ice will disappear because of melting ice?

We have to assume that fish needs ice in order to survive. But that's just another assumption.

I've eliminated D too, because the argument deliveres no further information whether it's good or bad if ice dissapears.... which influence it has on the fishes.. would be there more fishes or less etc.
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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02 May 2015, 20:48
BrainLab wrote:
nonameee wrote:
I understand (D) perfectly. But can someone please explain why fish under the ice will disappear because of melting ice?

We have to assume that fish needs ice in order to survive. But that's just another assumption.

I've eliminated D too, because the argument deliveres no further information whether it's good or bad if ice dissapears.... which influence it has on the fishes.. would be there more fishes or less etc.

Hi BrainLab,

Glad you raised the idea of certainty about the need for ice. The idea that Guillemots rely on ice, to at least a significant extent, isn't assumed. Yes, Guillemots could possibly get SOME fish from other means as you point out, but the facts in the prompt let us know that Guillemots specifically feed on fish that gather beneath thin sheets of floating ice. So would it SIGNIFICANTLY weaken (though not necessarily 100% destroy) the claim that the Guillemot range is likely to expand if the ice sheets that they typically feed on melt? For sure. They wouldn't be likely to feed in those areas, so it would be VERY challenging for the range to expand.

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?

(D) If the Arctic warming continues, much of the thin ice in the southern Arctic will disappear.

If option D were true, then it would STRONGLY put the Guillemots' source of food in doubt. Would that weaken the notion that the Guillemot range would expand? Yes.

(B) If the Arctic warming continues, Guillemots’ current predators are likely to succeed in extending their own range farther north.

Now, option B) is the statistical runner up. B definitely represents a possible increased threat to Guillemots if predators further expand their territory, but to what extent do these predators pose a risk to the Guillemot population? It's altogether unclear. Perhaps the predators pose very little risk, and perhaps it's even a significant risk. Is there any way from the prompt to determine the degree of that risk that the predators pose? No. Predators could exist or always exist in Guillemot territory, but the species can coexist just fine.

In comparing B) and D), B) presents an ambiguous risk to the enlargement of the Guillemot range, whereas D) delivers a massive blow to that notion if the specific types of places where the species traditionally searches for food will likely be wiped out.
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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26 May 2016, 05:46
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Re: Guillemots are birds of Arctic regions. They feed on fish [#permalink]

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26 May 2016, 05:52
EMPOWERgmatMax wrote:
BrainLab wrote:
nonameee wrote:
I understand (D) perfectly. But can someone please explain why fish under the ice will disappear because of melting ice?

We have to assume that fish needs ice in order to survive. But that's just another assumption.

I've eliminated D too, because the argument deliveres no further information whether it's good or bad if ice dissapears.... which influence it has on the fishes.. would be there more fishes or less etc.

Hi BrainLab,

Glad you raised the idea of certainty about the need for ice. The idea that Guillemots rely on ice, to at least a significant extent, isn't assumed. Yes, Guillemots could possibly get SOME fish from other means as you point out, but the facts in the prompt let us know that Guillemots specifically feed on fish that gather beneath thin sheets of floating ice. So would it SIGNIFICANTLY weaken (though not necessarily 100% destroy) the claim that the Guillemot range is likely to expand if the ice sheets that they typically feed on melt? For sure. They wouldn't be likely to feed in those areas, so it would be VERY challenging for the range to expand.

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?

(D) If the Arctic warming continues, much of the thin ice in the southern Arctic will disappear.

If option D were true, then it would STRONGLY put the Guillemots' source of food in doubt. Would that weaken the notion that the Guillemot range would expand? Yes.

(B) If the Arctic warming continues, Guillemots’ current predators are likely to succeed in extending their own range farther north.

Now, option B) is the statistical runner up. B definitely represents a possible increased threat to Guillemots if predators further expand their territory, but to what extent do these predators pose a risk to the Guillemot population? It's altogether unclear. Perhaps the predators pose very little risk, and perhaps it's even a significant risk. Is there any way from the prompt to determine the degree of that risk that the predators pose? No. Predators could exist or always exist in Guillemot territory, but the species can coexist just fine.

In comparing B) and D), B) presents an ambiguous risk to the enlargement of the Guillemot range, whereas D) delivers a massive blow to that notion if the specific types of places where the species traditionally searches for food will likely be wiped out.

My concern is whether option D , which says that much of thin ice in southern arctic will disappear, this would strengthen to the conclusion in a way Guillemots will expand to north ? Please let me know whether my thinking is correct or my assumption that in north there will be thin ice and fishes under it ?
Re: Guillemots are birds of Arctic regions. They feed on fish   [#permalink] 26 May 2016, 05:52
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