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]

12 Apr 2010, 05:40

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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 [#permalink]

12 Apr 2010, 06:54

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 [#permalink]

12 Apr 2010, 10:03

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 [#permalink]

12 Apr 2010, 12:27

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 [#permalink]

12 Apr 2010, 13:51

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 [#permalink]

13 Apr 2010, 02:51

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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 [#permalink] 13 Apr 2010, 02:51

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

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