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# CR - Strengthen the argument

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Re: CR - Strengthen the argument [#permalink]
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souvik101990 wrote:

Strengthen/Weaken exercise

The prairie vole, a small North American grassland rodent, breeds year around, and a group of voles living togather consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn to winter; from spring thru early autumn, however, most voles live in far smaller groips. The seasonal variation in groups size can probably be explained by a seasonal variation in mortality among young voles.

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

A) It is the spring and in the 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 prairie vole's habitat are often harsh, with temperatures that drop well below freezing.
E) Snakes, a major predator of young prairie voles, or active only from spring thru early autumn.

I will post answer and explanation tomorrow. Let's get this party going.
This is an official question. Please do not google. Try it yourself.

I would like to answer to this
I pick E

Conclusion: The seasonal variation in groups size can probably be explained by a seasonal variation in mortality among young voles
Which says the seasonal variation in group soze is explained by variation in mortality rate caused seasonally
Assumption: 1) either they die because of season change (or) Die because of some natural (or) split and live because of their nature for each season

So i picked E.

Thanks,
Swami.
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Re: CR - Strengthen the argument [#permalink]
IMO E.

Only E explains the seasonal factor which reduces vole population between sprig and autumn.

C and D need too much assumptions to churn out the connection between seasonal population change.

A and B does not address seasonal population change.
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Re: CR - Strengthen the argument [#permalink]
I have recently given my GMAT official exam. I got this exact question in my GMAT verbal section and i answered option E. It it the correct answer?
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Re: CR - Strengthen the argument [#permalink]
The right answer here should be E. When you look to support a conclusion, you should first identify what that conclusion is. In this case, it's that "something affects the population in spring - autumn".

Hence, we want an answer that either suggests the population will be lower in the spring, or that will be higher in the winter.

Once you eliminate the opposites and irrelevant answers, E is all you should have left.

- Matoo
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Re: CR - Strengthen the argument [#permalink]
souvik101990 wrote:

Strengthen/Weaken exercise

The prairie vole, a small North American grassland rodent, breeds year around, and a group of voles living togather consists primarily of an extended family, often including two or more litters. Voles commonly live in large groups from late autumn to winter; from spring thru early autumn, however, most voles live in far smaller groips. The seasonal variation in groups size can probably be explained by a seasonal variation in mortality among young voles.

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

A) It is the spring and in the 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 prairie vole's habitat are often harsh, with temperatures that drop well below freezing.
E) Snakes, a major predator of young prairie voles, or active only from spring thru early autumn.

I will post answer and explanation tomorrow. Let's get this party going.
This is an official question. Please do not google. Try it yourself.

The question says the seasonal variation in group sizes can probably be explained by seasonal variation in mortality among young volves, and for me, option D answers this. The extremely low temperatures in winters is what increases the mortality rate of young volves. Additional information strengthening the conclusion of the statement.

I would avoid option E, as the use of "only" makes it too extreme.

Thoughts?
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Re: CR - Strengthen the argument [#permalink]
Quote:
The question says the seasonal variation in group sizes can probably be explained by seasonal variation in mortality among young volves, and for me, option D answers this. The extremely low temperatures in winters is what increases the mortality rate of young volves. Additional information strengthening the conclusion of the statement.

I would avoid option E, as the use of "only" makes it too extreme.

Thoughts?

OhsostudiousMJ
When you look to eliminate an extreme answer choice, do not do so solely on the basis of the presence of a word like only, or always. What you have to consider is the meaning and implication of the statement itself. You're not looking to suggest whether the option is "true" or not, you are looking to analyse how it impacts the argument.

In E, when it says "only present in the spring", what it tells us is that it's not there in the other time of the year, when the voles are many. So when the snakes are active, the voles are few, when they are not, the voles are many. This is a statement that clearly supports the idea that there is a mortality from spring to autumn.

D in fact suggests the opposite of what we are looking for. Sure, harsh winters means few voles in the winter. But this is precisely when we've been told that there are many of them. So if anything, this suggests that the winter has no effect.

- Matoo
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Re: CR - Strengthen the argument [#permalink]
MatooCrackVerbal wrote:
Quote:
The question says the seasonal variation in group sizes can probably be explained by seasonal variation in mortality among young volves, and for me, option D answers this. The extremely low temperatures in winters is what increases the mortality rate of young volves. Additional information strengthening the conclusion of the statement.

I would avoid option E, as the use of "only" makes it too extreme.

Thoughts?

OhsostudiousMJ
When you look to eliminate an extreme answer choice, do not do so solely on the basis of the presence of a word like only, or always. What you have to consider is the meaning and implication of the statement itself. You're not looking to suggest whether the option is "true" or not, you are looking to analyse how it impacts the argument.

In E, when it says "only present in the spring", what it tells us is that it's not there in the other time of the year, when the voles are many. So when the snakes are active, the voles are few, when they are not, the voles are many. This is a statement that clearly supports the idea that there is a mortality from spring to autumn.

D in fact suggests the opposite of what we are looking for. Sure, harsh winters means few voles in the winter. But this is precisely when we've been told that there are many of them. So if anything, this suggests that the winter has no effect.

- Matoo

Thanks for the response.

I understand now. I had misunderstood the question initially.
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Re: CR - Strengthen the argument [#permalink]
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Re: CR - Strengthen the argument [#permalink]
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