In order to withstand tidal currents, juvenile horseshoe : GMAT Critical Reasoning (CR) - Page 2
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# In order to withstand tidal currents, juvenile horseshoe

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17 Aug 2011, 13:39
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17 Aug 2011, 17:14
Simply E

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17 Aug 2011, 22:03
E
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18 Aug 2011, 08:37
mailpravs wrote:
Its E.

+1 E

There's not enough time for the population to grow
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20 Aug 2011, 17:13
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24 Aug 2011, 10:37
opps...its E
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24 Aug 2011, 10:38
what is the source
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03 Sep 2011, 22:39
A straight E, I think.
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03 Nov 2011, 22:37
Simply E

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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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19 Nov 2011, 12:30
I am still not convinced with the explanation. Sure E is best out of the lot but I dn't agree with the reasoning. Any more thoughts on this?
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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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20 Nov 2011, 14:50
chose B
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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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20 Nov 2011, 17:28
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E explain why there are less barnacles on the shell of the crab, it is not because sand or tidal wave strenght but because the crab 'shed their shells and grow new ones several times a year'
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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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10 Jan 2012, 03:15
Between A and E chose A,should have read more carefully.
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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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21 Aug 2012, 06:11
This is an Explain the Paradox question type!

Premises:
- juvenile horseshoe crabs frequestly burrow in sand to withstand tidal currents
- burrowing discourages barnacles from clinging to juvie's shells
- fully grown horseshoe crabs can readily withstand tidal currents without burrowing and therefore acquire substancial populations of barnacles

Conc:
- in areas where tidal currents are weak, juvenile horshoe crabs found not ot have significant barnacle populations, even though theyy seldom burrow

a) we already know that BURROWING does. this does not explain anything.
b) then there should be MORE barnacles on their shells.. opp direction
c) tempting but doesn't FULL explain... what is the range of this strength? doesn't really answer our discrepancy
d) out of scope.
e) bingo! if horse shoe crabs are shedding their shells and growing new ones, this w ould explain why we didnt find significant barnacles on their shells even though they weren't burrowing.

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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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27 Aug 2012, 11:53
noboru wrote:
In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand. Such burrowing discourages barnacles from clinging to their shells. When fully grown, however, the crabs can readily withstand tidal currents without burrowing, and thus they acquire substantial populations of barnacles. Surprisingly, in areas where tidal currents are very weak, juvenile horseshoe crabs are found not to have significant barnacle populations, even though they seldom burrow.

Which of the following, if true, most helps to explain the surprising finding?

(A) Tidal currents do not themselves dislodge barnacles from the shells of horseshoe crabs.
(B) Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest.
(C) The strength of the tidal currents in a given location varies widely over the course of a day.
(D) A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food.
(E) Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year.

I had a really hard time understanding Choice A. I'm wondering if my thought process is correct in disqualifying A now.

Here's how I understand the argument:
- high tidal waves --> more burrowing for juvenile horseshoe crabs --> decreased barnacles
BUT ALSO
- low tidal waves --> less burrowing for juvenile horseshoe crabs --> decreased barnacles
how can this be?

A. Tells us that the water tides don't matter. So the less or more barnacle populations have to do with burrowing then (given the premises). So we are left with the situation where:
- more burrowing --> less barnacle population
- less burrowing --> less barnacle population

Is this accurate?
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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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29 Aug 2012, 23:57
A really good question. Going through the above posts I understand that this one is from OG12. Took me a really long time at close to 3 mins to reach E. I had to re-read the question stem to resolve this one.

The key to this question is spotting the word "Juvenile". The last statement is about the "juvenile" crabs and not the full grown ones. This makes the statement about full-grown crabs not having to burrow irrelevant in the given argument.

E correctly gives us a reason as to why not a large population of barnacles was not found i.e. since the juvenile crabs shed their shells regularly till full grown.
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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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30 Aug 2012, 00:09
dpvtank wrote:
noboru wrote:
In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand. Such burrowing discourages barnacles from clinging to their shells. When fully grown, however, the crabs can readily withstand tidal currents without burrowing, and thus they acquire substantial populations of barnacles. Surprisingly, in areas where tidal currents are very weak, juvenile horseshoe crabs are found not to have significant barnacle populations, even though they seldom burrow.

Which of the following, if true, most helps to explain the surprising finding?

(A) Tidal currents do not themselves dislodge barnacles from the shells of horseshoe crabs.
(B) Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest.
(C) The strength of the tidal currents in a given location varies widely over the course of a day.
(D) A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food.
(E) Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year.

I had a really hard time understanding Choice A. I'm wondering if my thought process is correct in disqualifying A now.

Here's how I understand the argument:
- high tidal waves --> more burrowing for juvenile horseshoe crabs --> decreased barnacles
BUT ALSO
- low tidal waves --> less burrowing for juvenile horseshoe crabs --> decreased barnacles
how can this be?

A. Tells us that the water tides don't matter. So the less or more barnacle populations have to do with burrowing then (given the premises). So we are left with the situation where:
- more burrowing --> less barnacle population
- less burrowing --> less barnacle population

Is this accurate?

Let me take a dig at trying to explain the answer choice.

Choice A says that the tidal ways do not dislodge the barnacles from the crab-shells. Thus high or low tidal waves should not make a difference in the population of barnacles, instead burrowing should make all the difference i.e. less burrowing = more barnacles and vice-versa.

Hence in low tidal waves areas the juvenile crabs would burrow less hence ideally the population of barnacles on the juvenile crabs should be larger. However this is contrary to the observed phenomenon i.e. in low tidal areas the barnacle population on juvenile crabs was not found to be larger. Thus option A does not help us resolve the paradox. Hence A can be eliminated.

Hope this helps.
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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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07 Oct 2012, 03:47
I also selected E as the answer but i have a small doubt . what if the there are fully grown crabs in the weak tidal current area also , then choice e would not hold true because according to the answer choice fully grown crabs won't shed their shells. also in the premise the fully grown crabs have the maximum barnicles. do we have to assume that the weak tidal area do not have a substantial population of fully grown crabs ?
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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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07 Oct 2012, 22:27
In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand. Such burrowing discourages barnacles from clinging to their shells. When fully grown, however, the crabs can readily withstand tidal currents without burrowing, and thus they acquire substantial populations of barnacles. Surprisingly, in areas where tidal currents are very weak, juvenile horseshoe crabs are found not to have significant barnacle populations, even though they seldom burrow.

Which of the following, if true, most helps to explain the surprising finding?

(A) Tidal currents do not themselves dislodge barnacles from the shells of horseshoe crabs.
(B) Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest.
(C) The strength of the tidal currents in a given location varies widely over the course of a day.
(D) A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food.
(E) Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year.

This is more of a resolve the paradox question. Here E gives us a clear explanation of why the finding is surprised.
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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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29 Apr 2013, 05:15
The paradox is about the juvenile crabs only. Information about Adults is given to highlight that tidal currents causes juveniles to burrow --> burrowing leads to shedding of barnacle population. Essentially, the argument attributes the lack of barnacle population on juvenile crabs to the act of burrowing.

However, there is a paradox because even in weak tidal current areas where burrowing does not happen, the lack of barnacle population on juvenile crabs is observed.

How to resolve the paradox? By attributing the lack of barnacle population on juvenile crabs to something else than the tidal currents. Choice E solves that. If there is some other reason than what is assumed, then the paradox is solved!
Re: In order to withstand tidal currents, juvenile horseshoe   [#permalink] 29 Apr 2013, 05:15

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