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Boreal owls range over a much larger area than do other owls

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Boreal owls range over a much larger area than do other owls  [#permalink]

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New post Updated on: 24 Jul 2018, 16:56
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Official Guide for GMAT Verbal Review, 2nd Edition

Practice Question
Question No.: 59 in Verbal OG 2nd Edition but this is a different question from the #579 in OG 2019
Page: 140

Boreal owls range over a much larger area than do other owls of similar size. The reason for this behavior is that the small mammals on which owls feed are especially scarce in the forests where boreal owls live, and the relative scarcity of prey requires the owls to range more extensively to find sufficient food.

Which of the following ,if true, most helps to confirm the explanation above?

(A) Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges.

(B) Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant

(C) After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young.

(D) Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range rather than a few hundred yards.

(E) The boreal owl requires less food, relative to its weight, than is required by members of other owl species.

Originally posted by bigfernhead on 20 Nov 2008, 20:39.
Last edited by bb on 24 Jul 2018, 16:56, edited 4 times in total.
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post Updated on: 07 Oct 2013, 09:07
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Darmody wrote:
The OA is B and it is coming from OG verbal question 59

But I really don't agree with this one.

First answer B is talking about "food eaten by the small mammals" not the small mamals themselves on which the owls prey. The explanation of the OG says that the presence of the small mammals and the food they eat is correlated and that abundance of this food means abundance of small mammals. But I don't think this inference is obvious as a perfectly valid explanation would be that the abundance of small mammals foods is due to the scarcity of their prey. And understood this way B weakens the explanation instead of strengthening it.

Second I think answer D is a way better choice. Indeed if D is correct then this means that when the boreal owl does not have to look for food and has a single location where to hunt, it does not range over a very large area as it usually does. Then, we can correctly infer that the reason the boreal owl range over a very large area is indeed because it needs to look for food, therefore D confirms the explanation.


Hi Darmody,

This is a tough question because of the complicated language used in the argument.

The problem with (B) is in two words "sometimes" and "individual". If only a few boreal owls sometimes hunt near a single location, then that will not explain the characteristic of boreal owls in general. Second, saying that owls hunt not for food will be a far fetched assumption.

Moreover if OG says that OA is (B) we can not challenge it. The best thing is to try to understand why is it correct and why others aren't. We are playing a game that GMAT test makers make and we have to learn their rules to master the test. So, any efforts to challenge an OA from OG will no be of much use.

OG correctly mentions the correlation between presence of the small mammals and the food they eat. It is not a far fetched assumption. If the food for small mammals is scattered then the mammals are also scattered in a large forest area. The stimulus mentions that the small mammals on which boreal owls feed are scarce, so, their food is scattered these scarce mammals will also be scattered. So, boreal owls have to cover a larger area to find "sufficient" food, which is mentioned in the last sentence. Also note that this answer choice "most" helps to explain the owl's behavior; it is the best choice among all the other choices.

Hope that helps,

Vercules
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Originally posted by Vercules on 25 Feb 2013, 13:59.
Last edited by Narenn on 07 Oct 2013, 09:07, edited 1 time in total.
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 21 Nov 2008, 05:43
I would go with option B for that it exactly supports the reason which is mentioned in the question [i.e reason of food being scarce]
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 21 Nov 2008, 12:21
Hi guys,

IMO B

A. Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges this answer does not add any support, just repeats the fact
B. Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant. Hold
C. After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young the text talks about boreal owls in general
D. Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range rather than a few hundred yards. the text doesn't say anything about this
E. The boreal owl requires less food, relative to its weight, than is required by members of other owl species. nothing to do with the text

Could some post the OA?

What's the source?

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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 12 Apr 2010, 04:40
Boreal owls range over a much larger area than do other owls of similar size. The reason for this behavior is probably that the small mammals on which owls feed are especially scarce in the forests where boreal owls live, and the relative scarcity of prey requires the owls to range more extensively to find sufficient food.
Which of the following, if true, most helps to confirm the explanation above?

A. Some boreal owls range over an area eight times larger than the area over which
any other owl of similar size ranges.
B. Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant.
C. After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young.
D. Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range farther than a few hundred yards.
E. The boreal owl requires less food, relative to its weight, than is required by members of other owl species.
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 12 Apr 2010, 05:54
Looks like B. It is the only sentence that almost repeats the premise and conclusion., thus reaffirming the explanation.

A is quantifying the premise ... no help.
C is concerned with the babies. To feed the babies or themselves is he same issue and does not explain the conclusion.
D this goes against the possible correlation.
E less or more, the owls still need the food. Not explaining the cause for longer flights.
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 12 Apr 2010, 09:03
A. Some boreal owls range over an area eight times larger than the area over which
any other owl of similar size ranges.
>> Will not affect the argument.
B. Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant.
>> YES. The argument specifies that this behaviour of Boreal owls is because of its food availability (Which is less due to scared prey). This supports the argument by giving evidence that if the food is abundant Boreal owl's range is less.C. After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young.
>> Do not talk about range.
D. Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range farther than a few hundred yards.
>> Weakens conclusion.
E. The boreal owl requires less food, relative to its weight, than is required by members of other owl species.
>> Not related.
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 12 Apr 2010, 11:27
I picked (C) because.....

B. Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant.

As per my understanding, (B) says opposite of what is given in the premise. Boreal owls range over larger areas where food eaten by small mammals is sparse. If food for small mammals is sparse then small mammals will not be found in those areas as they will gone to other places in search for their food.
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 12 Apr 2010, 12:51
seekmba ..you made me think. Still, I cannot come to the terms of including kids to solidify the argument.

This question is from GMAT OG Verbal Review 2nd edition Q 59. The answer is B.
Not C, because the option concerns a correlation between owl's need for food and the frequency with which owls hunt...[the argument concerns range ....]

http://books.google.com/books?id=W5XOhZ ... 22&f=false
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 13 Apr 2010, 01:51
2
premises : Boreal owls range over a much larger area than do other owls of similar size
The reason for this behavior is probably that the small mammals on which owls feed are especially scarce in the forests where boreal owls live.

the second premises clearly says it is the prey that is forcing owls to wander. on the other hand if the prey roamed in one target area the owls have no reason to leave

B supports this

B. Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant.
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 24 Feb 2013, 06:51
1
The OA is B and it is coming from OG verbal question 59

But I really don't agree with this one.

First answer B is talking about "food eaten by the small mammals" not the small mamals themselves on which the owls prey. The explanation of the OG says that the presence of the small mammals and the food they eat is correlated and that abundance of this food means abundance of small mammals. But I don't think this inference is obvious as a perfectly valid explanation would be that the abundance of small mammals foods is due to the scarcity of their prey. And understood this way B weakens the explanation instead of strengthening it.

Second I think answer D is a way better choice. Indeed if D is correct then this means that when the boreal owl does not have to look for food and has a single location where to hunt, it does not range over a very large area as it usually does. Then, we can correctly infer that the reason the boreal owl range over a very large area is indeed because it needs to look for food, therefore D confirms the explanation.
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 15 Apr 2016, 00:09
Conclusion : Scarcity of Prey resulted in increase of range for Owl.

Cause & Effect statement.

Option B establishes that Scarcity of Prey happened before the increase of range and strengthens the argument

Correct Answer
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 15 Oct 2016, 11:23
Vercules wrote:
Darmody wrote:
The OA is B and it is coming from OG verbal question 59

But I really don't agree with this one.

First answer B is talking about "food eaten by the small mammals" not the small mamals themselves on which the owls prey. The explanation of the OG says that the presence of the small mammals and the food they eat is correlated and that abundance of this food means abundance of small mammals. But I don't think this inference is obvious as a perfectly valid explanation would be that the abundance of small mammals foods is due to the scarcity of their prey. And understood this way B weakens the explanation instead of strengthening it.

Second I think answer D is a way better choice. Indeed if D is correct then this means that when the boreal owl does not have to look for food and has a single location where to hunt, it does not range over a very large area as it usually does. Then, we can correctly infer that the reason the boreal owl range over a very large area is indeed because it needs to look for food, therefore D confirms the explanation.


Hi Darmody,

This is a tough question because of the complicated language used in the argument.

The problem with (B) is in two words "sometimes" and "individual". If only a few boreal owls sometimes hunt near a single location, then that will not explain the characteristic of boreal owls in general. Second, saying that owls hunt not for food will be a far fetched assumption.

Moreover if OG says that OA is (B) we can not challenge it. The best thing is to try to understand why is it correct and why others aren't. We are playing a game that GMAT test makers make and we have to learn their rules to master the test. So, any efforts to challenge an OA from OG will no be of much use.

OG correctly mentions the correlation between presence of the small mammals and the food they eat. It is not a far fetched assumption. If the food for small mammals is scattered then the mammals are also scattered in a large forest area. The stimulus mentions that the small mammals on which boreal owls feed are scarce, so, their food is scattered these scarce mammals will also be scattered. So, boreal owls have to cover a larger area to find "sufficient" food, which is mentioned in the last sentence. Also note that this answer choice "most" helps to explain the owl's behavior; it is the best choice among all the other choices.

Hope that helps,

Vercules




I had made the same mistake as Darmody. So I analyzed the question, and this is what I think..

Option D is wrong because even if the option implies that the owls hunt nearby when they find food nearby does not necessarily lead to the conclusion that when they're going far, it is for food - the argument we have to strengthen. We need an option that will directly support the fact that the owls range is bigger because of the sparsity of food.
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 09 Aug 2017, 22:43
Here I have two sentences.
Could anyone tell me whether the comparison in the two sentences is different?

(1) Boreal owls range over a much larger area than do other owls of similar size.
(2) Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges.


I have been told that the second sentence is comparing different groups of boreal owls, while the first one is making a comparison between boreal owls and other owls.
Also, the OG solution has mentioned the same.

Is there any difference?? are they actually not the same? :?:
Really confused. :roll: :? :? :?

mikemcgarry, can you please share your thoughts on this?
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 10 Aug 2017, 00:43
1
Boreal owls range over a much larger area than do other owls of similar size. The reason for this behavior is that the small mammals on which owls feed are especially scarce in the forests where boreal owls live, and the relative scarcity of prey requires the owls to range more extensively to find sufficient food.

Which of the following ,if true, most helps to confirm the explanation above?


I also selected D as an option taking similar reasons as Darmody mentioned. But if the OG has an option B as correct answer so we will have to orient ourselves according to GMAT thinking to solve the Verbal problems and get a good score. Now the question stem suggests that the Boreal owls range a much larger area than other owls of similar size as the small mammals on which owl feed are scarce in the forests and hence they range in the larger area in search of food.

So, Final solution goes like this,

A. Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges.
This is just a fact which doesn't confirm the explanation.

B. Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant.
Since Boreal owls feed on mammals and these mammals food is sparse in certain area, So in these areas they roam around in a larger area to find food and hence Boreal owls have to range in a larger area to hunt these mammals. In the areas where food is abundant for these mammals, the mammals don't roam around for food and the Boreal owls has a similar trend of not roaming around for these mammals.
So , this might be a good confirmation to the explanation.

C. After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young.
This is natural and nowhere related to general tendency of Boreal owl's range being larger. Out of scope.

D. Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range rather than a few hundred yards.
This is talking about individual boreal owl and sometimes boreal owl do such thing which might be due to their ill health etc. So this option is very close but B is a better option.

E. The boreal owl requires less food, relative to its weight, than is required by members of other owl species.
Totally out of scope...
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 10 Aug 2017, 01:08
shashankism wrote:
Boreal owls range over a much larger area than do other owls of similar size. The reason for this behavior is that the small mammals on which owls feed are especially scarce in the forests where boreal owls live, and the relative scarcity of prey requires the owls to range more extensively to find sufficient food.

Which of the following ,if true, most helps to confirm the explanation above?


I also selected D as an option taking similar reasons as Darmody mentioned. But if the OG has an option B as correct answer so we will have to orient ourselves according to GMAT thinking to solve the Verbal problems and get a good score. Now the question stem suggests that the Boreal owls range a much larger area than other owls of similar size as the small mammals on which owl feed are scarce in the forests and hence they range in the larger area in search of food.

So, Final solution goes like this,

A. Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges.
This is just a fact which doesn't confirm the explanation.

B. Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant.
Since Boreal owls feed on mammals and these mammals food is sparse in certain area, So in these areas they roam around in a larger area to find food and hence Boreal owls have to range in a larger area to hunt these mammals. In the areas where food is abundant for these mammals, the mammals don't roam around for food and the Boreal owls has a similar trend of not roaming around for these mammals.
So , this might be a good confirmation to the explanation.

C. After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young.
This is natural and nowhere related to general tendency of Boreal owl's range being larger. Out of scope.

D. Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range rather than a few hundred yards.
This is talking about individual boreal owl and sometimes boreal owl do such thing which might be due to their ill health etc. So this option is very close but B is a better option.

E. The boreal owl requires less food, relative to its weight, than is required by members of other owl species.
Totally out of scope...


D. Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range rather than a few hundred yards.
Another approach of looking at option D -- If we negate this option D.
None of the times individual boreal owls hunt near a single location for many weeks at a time and do range considerably than a few hundred yards.
Conclusion of the above argument - The relative scarcity of the prey requires the owls to range more extensively to find sufficient food. The scarcity of the boreal owls' food/prey is leading to a more extensive range (a correlation exists here, we need to strengthen this CORRELATION). We have to support this. Even after negating the option D, we cannot strengthen the conclusion.

Negation simply says that boreal owls hunt near multiple locations and over large range, but it does not support that this is due to the scarcity of the mammals / food / prey of these boreal owls.

Also, option D starts with sometimes, then what about the other times. Just knowing about the some times, we cannot make a generic statement about all the times. So, option D is nowhere close to the correct answer my friend.
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 10 Aug 2017, 09:24
vnigam21 wrote:
Here I have two sentences.
Could anyone tell me whether the comparison in the two sentences is different?

(1) Boreal owls range over a much larger area than do other owls of similar size.
(2) Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges.


I have been told that the second sentence is comparing different groups of boreal owls, while the first one is making a comparison between boreal owls and other owls.
Also, the OG solution has mentioned the same.

Is there any difference?? are they actually not the same? :?:
Really confused. :roll: :? :? :?

mikemcgarry, can you please share your thoughts on this?

Dear vnigam21,

I'm happy to respond. :-)

There are a couple important differences in those two comparisons. Comparison #1 is very general, and by implication it discusses ALL boreal owls. Comparison #2 instead limits the scope to SOME boreal owls, not all, and it introduces a specific numerical measure for how much larger the area is. Those are the two most important differences between these comparisons.

Does this make sense?
Mike :-)
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 10 Aug 2017, 09:47
mikemcgarry wrote:
vnigam21 wrote:
Here I have two sentences.
Could anyone tell me whether the comparison in the two sentences is different?

(1) Boreal owls range over a much larger area than do other owls of similar size.
(2) Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges.


I have been told that the second sentence is comparing different groups of boreal owls, while the first one is making a comparison between boreal owls and other owls.
Also, the OG solution has mentioned the same.

Is there any difference?? are they actually not the same? :?:
Really confused. :roll: :? :? :?

mikemcgarry, can you please share your thoughts on this?

Dear vnigam21,

I'm happy to respond. :-)

There are a couple important differences in those two comparisons. Comparison #1 is very general, and by implication it discusses ALL boreal owls. Comparison #2 instead limits the scope to SOME boreal owls, not all, and it introduces a specific numerical measure for how much larger the area is. Those are the two most important differences between these comparisons.

Does this make sense?
Mike :-)


Thanks for the reply mikemcgarry. :) Sorry, But my question is still unanswered. :( I got the differences that you mentioned above....

(1) Boreal owls range over a much larger area than do other owls of similar size.
I am clear with this statement, it is making a comparison between boreal owls and other owls of similar size.

But I am not clear with this 2nd statement's explanation as given in the OG,

(2) Some boreal owls range over an area eight times larger than the area over which any other owl (how come this any other owl is boreal owl??) of similar size ranges.
the second sentence is comparing different groups of boreal owls??? how?
:? :? :?
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 10 Aug 2017, 15:48
2
vnigam21 wrote:
Thanks for the reply mikemcgarry. :) Sorry, But my question is still unanswered. :( I got the differences that you mentioned above....

(1) Boreal owls range over a much larger area than do other owls of similar size.
I am clear with this statement, it is making a comparison between boreal owls and other owls of similar size.

But I am not clear with this 2nd statement's explanation as given in the OG,

(2) Some boreal owls range over an area eight times larger than the area over which any other owl (how come this any other owl is boreal owl??) of similar size ranges.
the second sentence is comparing different groups of boreal owls??? how?
:? :? :?

Dear vnigam21,

I'm happy to respond. :-)

First of all, I want to call your attention to a very important distinction: the official questions (in the OG, Q & V Reviews, and in GMAT Prep) vs. the explanations for the official question. These two different items are two different ages, come from two different sources, and vary tremendously in level of quality.
1) Every official question in some test prep product is a retired GMAT question. These questions were written maybe a decade or more ago, went through rigorous psychometric testing in the experimental phase, and then were on the official GMAT for many years before they were retired. Behind each official question is a mountain of data and rigorous statistical analysis. It is no exaggeration to say that these questions are some of the finest test questions in the world, some of the finest ever created. I write question for a living, and at my very best, I am lucky to come even near to the high quality of these question.
2) The official explanations are different. When the questions were retired, say, and put into a book, someone had to slap together some explanations for the book. These were written by, I don't know, maybe some poor graduate student somewhere, and it's not clear to me that these have undergone any kind of substantial quality check and probably essentially no psychometric analysis. Just about every explanation I write, for my own questions or for official questions is better than these official explanations, and I would say the same for many other experts on GMAT Club.

The difference in quality is immense. I am lucky, at my very best, to come close to the quality of the official questions. By contrast, it is almost as if I could far surpass the quality of the official explanations in my sleep!

The moral is: trust the high quality of the official questions, but don't put too much trust into the official explanations. Trust that there are deep legitimate principles governing the logic of any official question, but don't necessary expect to find that well articulate in the official explanations. Instead, come here to GMAT Club, and get better explanations from test prep experts such as myself.

Why does the second sentence of the official explanation saying what it was saying? What was the starving graduate student in the basement thinking when he wrote that? Frankly, this is not the most important question for your GMAT preparation. Rather than worry about what the official explanation was trying or not trying to say, focus on finding somebody who can elucidate the sound logic of the question itself.

Here's the prompt:
Evidence: Boreal owls range over a much larger area than do other owls of similar size.
Claim: The reason for this behavior is that the small mammals on which owls feed are especially scarce in the forests where boreal owls live, and the relative scarcity of prey requires the owls to range more extensively to find sufficient food.

That's the argument, an attempt to explain the boreal owls' behavior. Is the explanation given the best explanation?: Could there be a better explanation? Could we make this explanation more plausible? Those questions outline the fulcrum on which the evaluation of this argument pivots.

Then the prompt question says:
Which of the following ,if true, most helps to confirm the explanation above?
So, we want to strengthen this explanation.

(A) Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges
First of all, this appears to strength the evidence. Strengthening the evidence in general is not a particularly effective way to strengthen the argument.
Also—and, who knows, this might be what the OE was trying fecklessly to say—this compares "some boreal owls" to all other birds. Group #1 is "some boreal owls" and Group #2 is every other bird on the planet. Of course, this latter group of all other birds, Group #2, includes, among many others, the rest of the boreal owls. Thus, "some boreal owls" have a particularly large range, but the others, included in Group #2, sound as if they might have small ranges. Hmm. If "some boreal owls" have gigantic ranges and the rest have relatively small ranges, then the explanation given might not be valid, because it wouldn't apply uniformly to all boreal owls.
These are the problems with (A).

(B), the OA, of course, does the job perfectly. I assume you understand that already.

Does all this make sense?
Mike :-)
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Re: Boreal owls range over a much larger area than do other owls  [#permalink]

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New post 16 Aug 2017, 11:45
Boreal owls range over a much larger area than do other owls of similar size. The reason for this behavior is that the small mammals on which owls feed are especially scarce in the forests where boreal owls live, and the relative scarcity of prey requires the owls to range more extensively to find sufficient food.

Which of the following ,if true, most helps to confirm the explanation above?

A. Some boreal owls range over an area eight times larger than the area over which any other owl of similar size ranges
Okay, some boreal owls might range over such a large area, but it doesn't talk about the entire boreal owl community. This is just a fact set.

B. Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant.
Correct. If the small mammals on which these owls feed range over a large area, then definitely the owls will also have to range over a much larger area, since these small mammals are already scarce, making it even more difficult for the owls to feed on them.

C. After their young hatch, boreal owls must hunt more often than before in order to feed both themselves and their newly hatched young
Okay, let them take care of their family, but it doesn't say anything about the owls scattering over a large area.

D. Sometimes individual boreal owls hunt near a single location for many weeks at a time and do not range rather than a few hundred yards.
Okay, let them hunt in a single location. Out of context

E. The boreal owl requires less food, relative to its weight, than is required by members of other owl species.
Okay, let this owl require lesser quantity of food than other owls do. Out of context.
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Re: Boreal owls range over a much larger area than do other owls &nbs [#permalink] 16 Aug 2017, 11:45

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