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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] New post 01 Sep 2011, 10:24
This is an assumption question. So if one of the statements in answer options is correct stimulus is correct.

New data can appear in answer options.

Premise1:A newborn kangaroo, or joey, is born after a short gestation period of only 39 days.

Premise2 : 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.

Conclusion: 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.

Assumption:Whatever is developed fully at birth is useful to serve some purpose.

A)Wrong - It generalizes phenomena(Specific to only few animals
B)Wrong - Relative advantages of development of forelimbs or hind limbs are not discussed.
C)Wrong - Paleontologists findings are no where assumed
D)Wrong - They can crawl into mothers pouch even if both fore limbs and hind limbs are fully developed at birth. It cant be that if they have only fore limbs fully developed they can crawl
E) Right - It states the assumption that fully developed forelimbs at the time of birth serves some purpose.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 10:28
The OA is E
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 10:46
Ans is D
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 11:04
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. (Talks about all animals and we do not care about all of them)
[B] Well developed forelimbs would have been more advantageous to ancient marsupial lions than well developed hind limbs would have been. (Talks about what would be better. Moreover, no where in the passage it is told that Well developed forelimbs are better then Well developed hind limbs. We are not comparing those two. The option which we need should refute the analogy mentioned in the passage )
[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. (paleontologists still do not know that whether newborn marsupial lion did climb into its mother’s pouch. The are just guessing by providing the analogy)
[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.(marsupial lions that crawled - out of scope)
[E] Newborn marsupial lions would not have had only their forelimbs developed if this development were of no use to the marsupial lions.

IMO:E.

The argument depends on the assumption that if marsupial lions are also born with their forelimbs developed then it's because they need those forelimbs.

And if you will negate option E the argument(conclusion) will fall apart.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 11:33
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 14:01
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.

My answer D
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 14:14
[C]
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 14:30
My answer is E.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 14:45
the answer id D
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 15:22
I would pick E,
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 15:40
I think the Answer is D.
A. generalizes that all animals born after short gestation period have underdeveloped parts.
B. The paragraph does not provide any relation between forelimb usage and hind limbs.
c. finding evidence is not something explored in the paragraph.
D. only new born with developed forelimbs can crawl into their mother's pouches. expresses the similarity how a marsupial lion was similar to a kangaroo
E. Restrict the development to forelimbs.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 18:34
D is the answer
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 18:57
I choose E. the assumption that i prephrased was "the lion mother's pouch is the only place where lions can further develop", which was not an answer choice. so I had to dig deeper.

by POE,
A)out of scope, passage does not discuss "all" animals, just kangaroos and marsupial lions
B)goes directly against passage. "the joey’s hind limbs are not well developed, but its forelimbs are well developed, so that it can can climb ...into its mother’s pouch"
C)out of scope, passage does not mention paleontologists or their findings

now between D/E: it was tough since the logic in the answer choices was so convoluted, but I threw out D.
D)extremely convoluted logic, double negatives. irrelevent information. any further development of the marsupial lion in the gestation period would not have anything to do with it's ability to crawl into the pouch, since the passage states that development of forearms is all that's needed to crawl into pouch.

E)correct choice. assumption lies in the fact that usage of the forearms is for getting into the mother's pouch. By negating this fact, the argument falls apart.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 19:05
E
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 19:36
Obviously E. the easy association with the development of forelimbs of lions to jumping to their mother's pouch assumes that forelimbs develop always for a purpose; in this case it was that of jumping to mother's pouch.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 19:43
D
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 19:56
E
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 19:58
E
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 20:42
Ans E.

If it is assumed that well developed forelimbs are not useful for anything then the conclusion that ancient marsupial lions used those limbs to climb up to their mother's pouch falls apart.
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Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests [#permalink] New post 01 Sep 2011, 20:50
The correct 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."

Explanation:

The premises are:
"A newborn kangaroo, or joey, is born after a short gestation period of only 39 days."
"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."

The conclusion is:
"Newborn marsupial lions must also have needed to climb into their mothers’ pouches."

The newborn marsupial lions have only forelimbs developed (which MAY allow them to climb into their mothers' pouches) and they would not have had only their forelimbs developed if this development were of no use to the marsupial lions (that means they MUST also have needed to climb into their mothers’ pouches.). The answer choice E create a link to ensure the soundness of the conclusion.
Re: Knewton Challenge: Win Knewton Shirt and GMAT Club Tests   [#permalink] 01 Sep 2011, 20:50
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