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# In order to withstand tidal currents, juvenile horseshoe

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Director
Joined: 06 Jan 2008
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In order to withstand tidal currents, juvenile horseshoe [#permalink]

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21 May 2008, 06:22
00:00

Difficulty:

(N/A)

Question Stats:

50% (01:42) correct 50% (00:00) wrong based on 3 sessions

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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.

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Senior Manager
Joined: 14 Mar 2007
Posts: 295

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Location: Hungary
Re: CR - tidal currents [#permalink]

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21 May 2008, 07:03
May be E is correct. They shed their shell therefore barnacle cannot stick to their shell.

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Director
Joined: 14 Oct 2007
Posts: 751

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Location: Oxford
Schools: Oxford'10
Re: CR - tidal currents [#permalink]

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21 May 2008, 16:21
Premise: In strong currents, young crabs burrow, and adult crabs dont need to
Premise: Barnacles do not attach to burrowed crabs
Premise: Adults therefore have barnacles attached
Premise: In weak currents, young crabs do not burrow, but Still do not have barnacles.

Questions is asking how can the last premise be true? (surprising finding)

Answer is E, since yound crabs keep getting rid of their shells, their shells do not have the barnacle buildup

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Manager
Joined: 22 Dec 2007
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Re: CR - tidal currents [#permalink]

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21 May 2008, 16:31
E for me.

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Director
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Re: CR - tidal currents [#permalink]

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22 May 2008, 07:07
OA is E. Thanks

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Senior Manager
Joined: 07 Jan 2008
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Re: CR - tidal currents [#permalink]

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23 May 2008, 13:05
E. Until they are fully grown, horseshoe crabs shed their shells and grow new ones
several times a year.

E clearly explains why young ones do NOT have barnicles clinged to their shells!

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CEO
Joined: 17 May 2007
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Re: CR - tidal currents [#permalink]

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25 May 2008, 04:31
Straight E - its the only one that helps explain the discrepancy.

saravalli 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.

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Intern
Joined: 17 Mar 2008
Posts: 17

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Re: CR - tidal currents [#permalink]

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26 May 2008, 15:38
E for me. it is a straight forward one, which explains the discrepancy.

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Manager
Status: Dream big, work hard, and drink gallons of beer!
Joined: 11 Jun 2011
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Concentration: Finance, General Management
GMAT Date: 10-01-2011
WE: Web Development (Consulting)
Re: CR - tidal currents [#permalink]

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30 Jul 2011, 18:00
Although E is the most obvious choice here. Aren't we assuming here that shedding only affects areas with week tidal waves but not the other areas with the strong tidal waves? That means when they were found with barnacle population in the areas with strong tidal waves, they did not shed during that time. But when they were found in weak tidal waves, they were already done with shedding.
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Kudos [?]: 59 [0], given: 33

Re: CR - tidal currents   [#permalink] 30 Jul 2011, 18:00
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