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# Knewton Challenge: Win Knewton Shirt and GMAT Club Tests

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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  01 Sep 2011, 20:54
My answer is "E" .. The reasons are as below -

A - Incorrect - nowhere in the passage its said that marsupial lions had a short gestation. So, its good to reject this
B - Incorrect - This is wrong, the comparison what is more advantageous - forlimbs or hindlimbs is not necessary as per the
passage.
C - Incorrect - Out of context. Why should we bother about paleontologists are able to figure out something or not?
D - Incorrect - We are talking about climbing the mother's pouch because of hind legs being developed. Here they talk about
"crawling".
E - Correct - Forelimbs are developed for a purpose and this purpose seems to go well with the hypothesis.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  01 Sep 2011, 21:27
A newborn kangaroo, or joey, is born after a short gestation period of only 39 days. At this stage, the joey’s hind limbs are not well developed, but its forelimbs are well developed, so that it can can climb from the cloaca into its mother’s pouch for further development. The recent discovery that ancient marsupial lions were also born with only their forelimbs developed supports the hypothesis that newborn marsupial lions must also have needed to climb into their mothers’ pouches.

The argument in this passage relies on which of the following assumptions?

[A] All animals that are born after a short gestation period are born with some parts of their bodies underdeveloped.
Wrong. The passage doesn't talk about all animals
[B] Well developed forelimbs would have been more advantageous to ancient marsupial lions than well developed hind limbs would have been.
Wrong. We don't need to compare forelimbs and hindlimbs
[C] If the newborn marsupial lion did not climb into its mother’s pouch, then paleontologists would be able to find evidence of this fact.
Wrong. Maybe this is true. But again this doesn't concern us as this is a speculation about the future
[D] Newborn marsupial lions that crawled into their mothers’ pouches could not have done so had they not had only their forelimbs developed at birth.
Correct. Passage is about a specific parallel use of forelimbs in Joey and lions. For this parallel to be ture, the states fact, that forelimbs were used to climb into the mother's pouch should also be ture.
[E] Newborn marsupial lions would not have had only their forelimbs developed if this development were of no use to the marsupial lions.
Wrong. The passage talks about a specific use of the forelimb and not just any use
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  01 Sep 2011, 21:42
The answer is B . Since it is implied that fore limbs were more important than hind limbs for entering into the mother's pouch for further development.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  01 Sep 2011, 21:45
E.
The finding is that lions had only their forelimbs developed.
To say that they also climbed to mother's pouches relies on the assumption
E ie.,forelimbs had grown to help them in the process of climbing to their mother's pouch.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  01 Sep 2011, 22:27
Great question. The answer is D.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  01 Sep 2011, 22:48
D.

B is a baited AC
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  01 Sep 2011, 22:56
D
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  01 Sep 2011, 23:45
Ans is D
[D] Newborn marsupial lions that crawled into their mothers’ pouches could not have done so had they not had only their forelimbs developed at birth.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  01 Sep 2011, 23:46
Ans
[D] Newborn marsupial lions that crawled into their mothers’ pouches could not have done so had they not had only their forelimbs developed at birth.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  02 Sep 2011, 00:50
D. Newborn marsupial lions that crawled into their mothers’ pouches could not have done so had they not had only their forelimbs developed at birth.
The fact that Joey's forelimbs being well developed, help him to climb from the cloaca into its mother’s pouch for further development. Along with it, it has been recently discovered that marsupial lions were also found to have forelimbs at the time of birth. So, forelimbs are a prerequisite for newborns to climb the pouch. This means, that the newborn marsupials would not be able to climb if they didn't had forelimbs developed at the time of their birth.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  02 Sep 2011, 00:51
I think the answer is D.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  02 Sep 2011, 02:03
A newborn kangaroo, or joey, is born after a short gestation period of only 39 days. At this stage, the joey’s hind limbs are not well developed, but its forelimbs are well developed, so that it can can climb from the cloaca into its mother’s pouch for further development. The recent discovery that ancient marsupial lions were also born with only their forelimbs developed supports the hypothesis that newborn marsupial lions must also have needed to climb into their mothers’ pouches.

The argument in this passage relies on which of the following assumptions?

[A] All animals that are born after a short gestation period are born with some parts of their bodies underdeveloped.
Well developed forelimbs would have been more advantageous to ancient marsupial lions than well developed hind limbs would have been.
[C] If the newborn marsupial lion did not climb into its mother’s pouch, then paleontologists would be able to find evidence of this fact.
[D] Newborn marsupial lions that crawled into their mothers’ pouches could not have done so had they not had only their forelimbs developed at birth.
[E] Newborn marsupial lions would not have had only their forelimbs developed if this development were of no use to the marsupial lion

The answer choice A is completely irreleavant as it talks about the gestaion period of the animals and the answer passage mentins nothing about the gestaation perod of marsupial lion.

Answer choice B compares well developed forelimbs as compared to hind limbs, where as hypothesis that newborn marsupial lions must also have needed to climb into their mothers’ pouches based on the fact that they have well developed forelimbs.

Answer Choice C is off tpoic as it states If the newborn marsupial lion did not climb into its mother’s pouch, then paleontologists would be able to find evidence of this fact, wheras the hypothesis that since they have well developed forelimbs they muist have needed to climb into there mother's pouches.

Answer Choice D seems very tempting but again be very careful as it states that marsupial lions that climb into their mother's pouches could not have done so without the well developed forelimbs remember that the hypothesesis is that since they have strong foelimbs they must have needed to climb in their mother's pouch. See the cause and effect relationship that the statement is giving.

SO cleary the answer choice E is correct since the have strong forelimbs they must have been for the reason-that is to climb in their mother's pouch just as joey uses them to climb.

Hope the answer and explanation is correct looking forward for the correct answer.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  02 Sep 2011, 02:16
Hello. This is my first time posting on GMATClub (or any forum for that matter), and I have only just started studying for the GMAT, but here it goes:

In this critical reasoning passage the author sets up a parallel logic between joeys and marsupial lions.

The base logic can be found in the following sentence:

"At this stage, the joey’s hind limbs are not well developed, but its forelimbs are well developed, so that it can can climb from the cloaca into its mother’s pouch for further development."

where, the prepositional phrase so that indicates that there exists a reason, a developmental significance, why the joeys are born with only well-developed forelimbs.

The parallel logic can then be understood as follows:

if:
when "a joey" is born with "only well-developed forelimbs", it is for the purpose of "climbing into the mother's pouch"
then:
when "a marsupial lion" is born with "only well-developed forelimbs" it must be for the purpose of "climbing into the mother's pouch"

The assumption in this line of logic is that if the well-developed forelimbs of the joeys have a purpose, or use, than the same developmental feature in the marsupial lions must also have a similar purpose.

Thus, the answer is [E] Newborn marsupial lions would not have had only their forelimbs developed if this development were of no use to the marsupial lions.

Hope that is clear! (and correct!)
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  02 Sep 2011, 02:56
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A newborn kangaroo, or joey, is born after a short gestation period of only 39 days. At this stage, the joey’s hind limbs are not well developed, but its forelimbs are well developed, so that it can can climb from the cloaca into its mother’s pouch for further development. The recent discovery that ancient marsupial lions were also born with only their forelimbs developed supports the hypothesis that newborn marsupial lions must also have needed to climb into their mothers’ pouches.

The argument in this passage relies on which of the following assumptions?

[A] All animals that are born after a short gestation period are born with some parts of their bodies underdeveloped.
[B] Well developed forelimbs would have been more advantageous to ancient marsupial lions than well developed hind limbs would have been.
[C] If the newborn marsupial lion did not climb into its mother’s pouch, then paleontologists would be able to find evidence of this fact.
[D] Newborn marsupial lions that crawled into their mothers’ pouches could not have done so had they not had only their forelimbs developed at birth.
[E] Newborn marsupial lions would not have had only their forelimbs developed if this development were of no use to the marsupial lions.

Evidence 1: For a new Kangaroo gestation period = 39days (SHORT GESTATION)
Evidence 2: Hind limbs are not well developed but Fore limbs are well developed. Why?
Evidence 3: So, that they can climb in to the pouch (Key word is So, that)
Main Conclusion: The evidence found in the lions strengthens the conclusion that developed forelimbs meant that they used this for climbing into the pouch of the adult lion.

Assumption should Eliminate a possibility of use of the fore limb or suggest some similiarity between Lions and Kangaroos.

A) INCORRECT. A addresses an assumption for Evidence 1, which is in fact irrelevant to the argument
B) INCORRECT. This highlights a relative comparison between the two limbs which is outside the scope of this argument.
C) INCORRECT. Outside the scope of this argument as well. Because it refers to a hypothetical possibility not relating to the evidence or the conclusion.
D) INCORRECT. This is the correct "wrong" answer. In fact this question talks about the possibility of not only this hind limbs. This statement talks about Fore limbs being the ONLY reason for the climbing. In fact this aspect of the argument is not discussed here. We only wish to know if the presence of a fore limb strengthens the fact that fore limbs are present for climbing into the pouch.
E) CORRECT. Try the negative test to confirm the answer: Newborn marsupial lions would not have had only their forelimbs developed if this development were used by the marsupial lions. This is also the only answer which connects the new born marsupials to the EVIDENCE OF ANCIENT MARSUPIALS (which maybe adults or young ones).
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  02 Sep 2011, 03:28
In my opinion it is D.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  02 Sep 2011, 03:36

It is assumed that due to well developed forelimb only marsupial lions could climb to their Mother's lap.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  02 Sep 2011, 03:51
D
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  02 Sep 2011, 04:43
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  02 Sep 2011, 05:06
it's [D]

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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink]  02 Sep 2011, 05:24
I think the answer must be "A"

[A] All animals that are born after a short gestation period are born with some parts of their bodies underdeveloped.
Clearly supports the hypothesis. Since body parts are not completely developed, so it will need to climb into its mother's pouch to get developed.
[B] Well developed forelimbs would have been more advantageous to ancient marsupial lions than well developed hind limbs would have been.
NO relation to the hypothesis
[C] If the newborn marsupial lion did not climb into its mother’s pouch, then paleontologists would be able to find evidence of this fact.
No mention of paleontologists in the discussion
[D] Newborn marsupial lions that crawled into their mothers’ pouches could not have done so had they not had only their forelimbs developed at birth.
Not only forelimbs development is needed.
[E] Newborn marsupial lions would not have had only their forelimbs developed if this development were of no use to the marsupial lions.
out of scope
Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests   [#permalink] 02 Sep 2011, 05:24

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# Knewton Challenge: Win Knewton Shirt and GMAT Club Tests

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