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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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13 Jul 2010, 07:57
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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.

OA After Discussion!
[Reveal] Spoiler: OA

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13 Jul 2010, 08:14
raghavakumar85 wrote:
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.>>> Never assumed, and negating this option doesn't help
b.Well developed forelimbs would have been more advantageous to ancient marsupial lions than well developed hind limbs would have been.>>> No discussion about the COMPARISON of forelimbs with Hind-limbs is done..
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. >>> Out of scope
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
e.Newborn marsupial lions would not have had only their forelegs developed if this development were of no use to the marsupial lions.>>> Development can serve some other purpose also..

OA After Discussion!

IMO D

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13 Jul 2010, 09:09
No, That's not the OA anyways!
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13 Jul 2010, 10:08
E

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13 Jul 2010, 10:59
i am assuming forelimbs(given in stimulus) means forelegs

only D and E are close

d talks abt jumping into pouche using the legs
e talks abt legs development. the arg talks abt usage of forelimbs for further development of hind limbs
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13 Jul 2010, 11:09
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Difficult one .. will go with d

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13 Jul 2010, 11:45
nverma wrote:
raghavakumar85 wrote:
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.>>> Never assumed, and negating this option doesn't help
b.Well developed forelimbs would have been more advantageous to ancient marsupial lions than well developed hind limbs would have been.>>> No discussion about the COMPARISON of forelimbs with Hind-limbs is done..
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. >>> Out of scope
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
e.Newborn marsupial lions would not have had only their forelegs developed if this development were of no use to the marsupial lions.>>> Development can serve some other purpose also..

OA After Discussion!

Initially chosen D, but i think C is also a strong contender here..!!

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13 Jul 2010, 18:07
I'll go with E

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+1 kudos me if this is of any help...

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13 Jul 2010, 22:02
Raghav - pls post oa

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14 Jul 2010, 04:03
D
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15 Jul 2010, 06:01
IMO D...OA pls???

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15 Jul 2010, 06:01
OA???

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15 Jul 2010, 20:02
Is it E ??

Para assumes that the only reason for developed forelimbs is so that the offspring can climb into mother's pouch.
E provides and alternate theory for the limbs (useless).

My 2 cents (very first on this forum)

Any one knows the QA ? whats the source ?

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16 Jul 2010, 02:45
IMHO B

The comparision of forelimbs and hindlimbs seems to be justified in this option.

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16 Jul 2010, 09:20
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Well, the OA is E guys! But, initially i thought it is out of scope and picked D.
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16 Jul 2010, 22:43
Thanks ! Kudos for the question.

raghavakumar85 wrote:
Well, the OA is E guys! But, initially i thought it is out of scope and picked D.

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17 Jul 2010, 10:40
E for me.

marsupial lions had ONLY forelimbs developed ==> because marsupial lions must have needed to climb into their mothers' pouches.

so the assumption is that marsupial lions would have had their forelimbs developed if the forelimbs were of no use.

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09 Nov 2010, 14:37
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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.

--------------------------------------------------------------------------------------------------------------
can't really understand the debate D vs E; d does not even come close..
use assumption negation technique:
E) new born lions would have had only their forelegs developed if this developement were of no use to the mansupial lions----- simplify----------- forelimbs are developed only because they have no use..
from the stem - assumption is ( beacuse the forelimbs are developed THEY have to climb blah blah ..)
so negating E weakens the argument and is the ans!
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11 Nov 2010, 09:06
E +1
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11 Nov 2010, 12:36
E it is......GOT it right!!

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Re: Fore Limbs   [#permalink] 11 Nov 2010, 12:36

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