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A newborn kangaroo, or joey, is born after a short gestation

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A newborn kangaroo, or joey, is born after a short gestation [#permalink]

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New post 11 Aug 2011, 10:23
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Question Stats:

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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 forelegs developed if this development were of no use to the marsupial lions.


I found that in Knewton and could not find the connection between forelegs and the Question (hope it's a typo)
[Reveal] Spoiler: OA
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Re: knewton-forelegs or forelimbs [#permalink]

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New post 11 Aug 2011, 11:14
You're confusing yourself out of understanding the question. Forelegs = Forelimbs same thing. Forelegs and Hindlimbs not the same thing.

Answer: [E] Newborn marsupial lions would not have had only their forelegs developed if this development were of no use to the marsupial lions.

The argument is "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."

E is the assumption that if the Marsupial lions didn't need to climb into the mothers pouch, they would have not have been born with developed forelimbs/forelegs (same thing). So by assuming that the lions wouldn't have developed if not for that need to climb into the pouch, the passage is true.

Therefore, E
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Re: knewton-forelegs or forelimbs [#permalink]

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New post 12 Aug 2011, 02:39
crap,went for D instead.
Negating D, I got the reasoning that the baby lions used some other means to climb into their mother's pouch.Hence crashing the conclusion.

As for E, negating it,i'm not sure how it crashes the conclusion,though.
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Re: knewton-forelegs or forelimbs [#permalink]

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New post 16 Aug 2011, 10:44
this was a good exercise, i didnot find any typo in it, I got E

I shortlisted to C & E and finally came down to C
Reason i didnot get to select C because of the premise in argument that "forelimbs developed supports the hypothesis that newborn marsupial lions must also have needed to "
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Re: A newborn kangaroo, or joey, is born after a short gestation [#permalink]

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New post 21 Mar 2014, 19:18
help!!! What is the resoning between D & E that sets E right and D wrong?
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Re: A newborn kangaroo, or joey, is born after a short gestation [#permalink]

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New post 21 Mar 2014, 22:19
imo, the word "only" in D is what makes it wrong. loosely translated, it says that had any of the baby's other body parts been developed at birth (in addition to its forelimbs), then it would not have been able to climb into the pouch.

E is essentially saying that there is a reason why the baby's had only their forelegs developed (i.e. more generally, it is negating the possibility of coincidence or randomness).
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Re: A newborn kangaroo, or joey, is born after a short gestation [#permalink]

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New post 11 Jul 2014, 00:33
The argument make that assumption that says young marsupial lions have developed forelimbs in order to be able to climb into their mothers' pouches.
Option E relates to this assumption and hence is correct. :-)
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Re: A newborn kangaroo, or joey, is born after a short gestation [#permalink]

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New post 10 Jun 2016, 06:15
Can anyone give me a proper negation of D and E as there are two " not " in it ? How to negate properly in 2 not's ; i am clear with one
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Re: A newborn kangaroo, or joey, is born after a short gestation [#permalink]

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New post 13 Jun 2016, 09:05
Really confusing answer choices.
Can experts also comment what is wrong with A?
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Re: A newborn kangaroo, or joey, is born after a short gestation [#permalink]

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New post 19 Jul 2016, 05:50
Please find inline comments :
Premise: A newborn kangaroo 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.

Prethinking :

1. Forelimbs are not developed without any purpose to be served.

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.

It doesn't speak about developed bodies and the reason of their existence , hence OOS

(B) Well developed forelimbs would have been more advantageous to ancient marsupial lions than well developed hind limbs would have been.

it doesn't specify the use of forelimb in climbing , comaprision here doesn't affect conclusion , incorrect

(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.

Doesn't affect the conclusion that forelimbs are used to climb . , incorrect

(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.

It is not a assumotion and it is other way to say the conclusion () Incorrect

(E) Newborn marsupial lions would not have had only their forelegs developed if this development were of no use to the marsupial lions.

Correct answer , assert on the reasoning that the forelegs are developed for a purpose
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Re: A newborn kangaroo, or joey, is born after a short gestation [#permalink]

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New post 19 Jul 2016, 07:12
Expert's post
sa18 wrote:
Really confusing answer choices.
Can experts also comment what is wrong with A?


An assumption is a statement that MUST BE true in order to link the premise with the conclusion. In this question:

Premise 1 (P1): Joey has developed forelimbs to climb into mother's pouch.
Premise 2 (P2): Marsuptial lions have developed forelimbs.
Conclusion (C): Marsuptial lions also needed to climb into mother's pouch.

Option A is not a mandatory link between P1/P2 and C, and hence not an assumption.
Re: A newborn kangaroo, or joey, is born after a short gestation   [#permalink] 19 Jul 2016, 07:12
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A newborn kangaroo, or joey, is born after a short gestation

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