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The prairie vole, a small North American grassland rodent,

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The prairie vole, a small North American grassland rodent, [#permalink] New post 26 Apr 2008, 08:03
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A
B
C
D
E

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77% (02:13) correct 23% (00:56) wrong based on 216 sessions
The prairie vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn through to winter; from spring through early autumn, however, most voles live in far smaller groups. The seasonal variation in group size can probably be explained by seasonal variation in mortality among young voles.

Which of the following, if true, provides the strongest support for the explanation offered ?

A. It is in the spring and early summer that prairie vole communities generally contain the highest proportion of young voles.

B. Prairie vole populations vary dramatically in size from year to year.

C. The prairie vole subsists primarily on broad-leaved plants that are abundant only in spring.

D. Winters in the prairie voles' habitat are often harsh, with temperatures that drop well below freezing.

E. Snakes, a major predator of young prairie voles, are active only from spring through early autumn.
[Reveal] Spoiler: OA

Last edited by Zarrolou on 03 May 2013, 06:35, edited 1 time in total.
Added OA
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Re: CR - voles mortality rate [#permalink] New post 26 Apr 2008, 09:59
E is the best answer
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Re: CR - voles mortality rate [#permalink] New post 27 Apr 2008, 00:35
I say E.

The argument implies that the variation in group size is related to the mortality rate in young voles. The groups are smallest from spring to early autumn. If snakes that eat young voles are only active from spring to early autumn, this would cause smaller groups during that time due to the fact that young voles are dying (being eaten). Therefore, this would support the argument.
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Re: CR - voles mortality rate [#permalink] New post 27 Apr 2008, 01:26
Why do prarie vols live in smaller groups from spring through early autumn? They get eaten by snakes!

E is the best answer.
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Re: CR - voles mortality rate [#permalink] New post 27 Apr 2008, 09:29
E is the correct answer.
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Re: CR - voles mortality rate [#permalink] New post 27 Apr 2008, 22:45
Another E.
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The prairle vole, a small North American grassland rodent, [#permalink] New post 01 Mar 2009, 06:20
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The prairle vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn through winter; from spring through early autumn, however, most voles live in far smaller groups. The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles.

Which of the followings, if true, provides the strongest support for the explanation offered?

1. It is in the spring and early summer that prairle vole communities generally contain the highest proportion of young voles.
2. Prairle vole populations vary dramatically in size from year to year
3. The prairle vole subsists primarily on bread-leaved plants that are abundant only in spring
4. Winters in the prairle voles’ habitat are often harsh, with temperatures that drop well below freezing.
5. Snakes, a major predator of young prairle vole, are active only from spring through early summer
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Re: CR: The prairle vole [#permalink] New post 01 Mar 2009, 06:33
Friend, One Request
pls mention GPREP Q in subject line(If you are knowingly posting GPrep Q)

Btw,good Q indeed :)
we have to justify/support the explanation here
How the seasonal variation in mortality among young voles??

Its D
because Snakes are killing the young voles during "early summer" period.
thanks.
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Re: CR: The prairle vole [#permalink] New post 01 Mar 2009, 10:55
nitya ....you mean E . Isnt ??
My choice is E .
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Re: CR: The prairle vole [#permalink] New post 01 Mar 2009, 10:57
nitya34 wrote:
Friend, One Request
pls mention GPREP Q in subject line(If you are knowingly posting GPrep Q)

Btw,good Q indeed :)
we have to justify/support the explanation here
How the seasonal variation in mortality among young voles??

Its D
because Snakes are killing the young voles during "early summer" period.
thanks.


you mean E, don't you? If yes, I agree with your reasoning.
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Re: CR: The prairle vole [#permalink] New post 01 Mar 2009, 15:34
reply2spg wrote:
The prairle vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn through winter; from spring through early autumn, however, most voles live in far smaller groups. The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles.

Which of the followings, if true, provides the strongest support for the explanation offered?

1. It is in the spring and early summer that prairle vole communities generally contain the highest proportion of young voles.
2. Prairle vole populations vary dramatically in size from year to year
3. The prairle vole subsists primarily on bread-leaved plants that are abundant only in spring
4. Winters in the prairle voles’ habitat are often harsh, with temperatures that drop well below freezing.
5. Snakes, a major predator of young prairle vole, are active only from spring through early summer


E is the best choice, because we are concerned here about the mortality among young voles, which is the main cause of the seasonal variation of Mortality among voles.
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Re: CR: The prairle vole [#permalink] New post 01 Mar 2009, 19:10
Another E

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Re: CR: The prairle vole [#permalink] New post 01 Mar 2009, 20:57
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Re: CR: The prairle vole [#permalink] New post 01 Mar 2009, 21:37
i think ans should be D, because the groups are large from aut to winter and spring to Autumn, the only period remain for smaller group is winter to spring. reason given in D clearly explains this, while the period in option E is when the group are large.
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Re: CR: The prairle vole [#permalink] New post 26 Oct 2009, 17:57
reply2spg wrote:
The prairle vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn through winter; from spring through early autumn, however, most voles live in far smaller groups. The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles.

Which of the followings, if true, provides the strongest support for the explanation offered?

1. It is in the spring and early summer that prairle vole communities generally contain the highest proportion of young voles.
2. Prairle vole populations vary dramatically in size from year to year
3. The prairle vole subsists primarily on bread-leaved plants that are abundant only in spring
4. Winters in the prairle voles’ habitat are often harsh, with temperatures that drop well below freezing.
5. Snakes, a major predator of young prairle vole, are active only from spring through early summer

It's a gmat prep indeed and OA is E. Mortality among young voles from spring through early summer because Snakes - a major predator of young prairle vole, are active only during this time
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Re: The prairie vole, a small North American grassland rodent, [#permalink] New post 23 Dec 2011, 03:13
E correct answer.
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Re: The prairie vole, a small North American grassland rodent, [#permalink] New post 23 Dec 2011, 04:05
with E,

Can anyone explain how C was thrown out?
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Re: The prairie vole, a small North American grassland rodent, [#permalink] New post 26 Dec 2011, 06:38
kotela wrote:
with E,

Can anyone explain how C was thrown out?



We need to support mortality as one of the reason for seasonal variation in group size

C is not showing coz of mortality

E is showing so E it is
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Re: The prairie vole, a small North American grassland rodent, [#permalink] New post 05 Mar 2013, 06:59
Why is D not correct in this? Is it because D does not mention an explicit link between harshness and infant mortality?
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Re: The prairie vole, a small North American grassland rodent, [#permalink] New post 01 May 2013, 09:51
mydreammba wrote:
with E,

Can anyone explain how C was thrown out?


C is wrong because if there is no food also older rodents will die.
D Ok harsh winter older rodents can die too.
Only E refers to a cause of death for young rodents
Re: The prairie vole, a small North American grassland rodent,   [#permalink] 01 May 2013, 09:51
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