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In order to withstand tidal currents, juvenile horseshoe

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

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New post 29 Jul 2010, 12:47
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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.
[Reveal] Spoiler: OA

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Re: juvenile horseshoe [#permalink]

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New post 05 Aug 2010, 19:09
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This is an OG Question Q No: 59, OG12.
We are apparently asked to resolve the paradox that although the tidal currents are weak and crabs don't burrow, the barnacle population is weak.
A. this gives a reason y there is significant barnacles in crabs that do not burrow. We are not looking out for this answer. Rather we want an answer that explains why there is less barnacle population.
B. This gives an additional premise for the argument and triggers more intrigues as to y there is less population of barnacles even though there are weak tidal currents.
C. Out of scope.
D. Out of scope. Nowhere in the argument, Food comes into picture.
E. Correct answer. This explains why Juvenile crabs have less barnacle population. When they shed their shells regularly, they also shed the barnacles that cling to them regularly. Thus, this explains the surprising finding.

Correct me if I'm wrong.

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Re: juvenile horseshoe [#permalink]

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New post 06 Aug 2010, 07:38
I picked E too because it explains why in areas of weak tidal currents there is lesser barnacle population. Because crabs shed their shells the barnacles are clinged on to the shedded shells and hence are not seen much clinged on to the carbs. (thus less population).
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Re: juvenile horseshoe [#permalink]

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The question statement first establishes a cause and effect relationship: burrowing causes lack of barnacles. The question then states an observation that non-burrowing crabs do not have barnacles. The observation is inconsistent with the cause and effect relationship that was previously stated. Thus, we must find a new cause for a crab's lack of barnacles in order to explain the surprising finding. Answer "E" establishes a new cause: frequent shell shedding.
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Re: juvenile horseshoe [#permalink]

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New post 16 Aug 2010, 09:19
i am still not able to stand why E is correct answer.the statement E have same effect whether horseshoe crabs stay in strong tide current region or weak tide current region.how it explain the low population of barnacle in weak tidal current area.
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Re: juvenile horseshoe [#permalink]

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New post 17 Aug 2010, 10:17
This is a Resolve the paradox Question.The Paradox is when the tides hit the Adult Crabs there will be barnacles attched to them But in weak tide (this is a decoy)areas even though the tides hit Juvenile crabs there are not more barnacles.The correct ans choice must allow both the facts to be true and explain the paradox.Only Option E tells how the Juveniles shed the shell and hence have no barnacles if Adults they wud have had clusters of Barnacles too
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Re: juvenile horseshoe [#permalink]

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New post 17 Aug 2011, 14:39
explaining a paradox type of question...E is the answer
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Re: juvenile horseshoe [#permalink]

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New post 17 Aug 2011, 18:14
Simply E

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Re: juvenile horseshoe [#permalink]

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New post 17 Aug 2011, 23:03
E
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Re: juvenile horseshoe [#permalink]

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New post 18 Aug 2011, 09:37
mailpravs wrote:
Its E.


+1 E

There's not enough time for the population to grow
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Re: juvenile horseshoe [#permalink]

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New post 20 Aug 2011, 18:13
Misreading gave me the wrong answer. damn
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Re: juvenile horseshoe [#permalink]

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New post 24 Aug 2011, 11:37
opps...its E
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Re: juvenile horseshoe [#permalink]

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New post 24 Aug 2011, 11:38
what is the source
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Re: juvenile horseshoe [#permalink]

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New post 03 Sep 2011, 23:39
A straight E, I think.
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New post 03 Nov 2011, 23:37
Simply E

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

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New post 19 Nov 2011, 13:30
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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New post 20 Nov 2011, 15:50
chose B :(
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Re: In order to withstand tidal currents, juvenile horseshoe [#permalink]

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New post 20 Nov 2011, 18:28
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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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New post 10 Jan 2012, 04:15
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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New post 21 Aug 2012, 07:11
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.

Answer is E
Re: In order to withstand tidal currents, juvenile horseshoe   [#permalink] 21 Aug 2012, 07:11

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