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Q33: In order to withstand tidal currents, juvenile

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Q33: In order to withstand tidal currents, juvenile [#permalink] New post 14 Oct 2005, 12:32
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Q33:
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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 [#permalink] New post 14 Oct 2005, 20:50
Just to bring this to top. I am clueless on this.
My mind now blank after being hooked on to this site the whole day!
Can take it no more today! I am going to bed now.

Thanks a million to nakib77, GMATT73, rahulrao and few others. Great Job!!

They are the ones keeping this forum alive by posting almost all of the questions - quality ones!!
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 [#permalink] New post 15 Oct 2005, 07:37
E. MOLTING!

It is the only logical explanation I can think of as to why the juvenile horseshoe crabs have no dangleberries clinging to their shells. All other answers are illogical.
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 [#permalink] New post 15 Oct 2005, 07:47
I'll take E. It suggests the barnacles population was not insignificant, just that the juvenile crab could have just shed their shells at the time of the study.
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Re: CR # horseshoe crabs [#permalink] New post 15 Oct 2005, 12:33
nakib77 wrote:
Q33:
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 would pick A. OA pls
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 [#permalink] New post 17 Oct 2005, 00:48
I pick (E).

(A) It is needless to say that the tidal currents themselves do not dislodge barnacles from the shells of the crabs, because we can already see that it is true from the sentence "the crabs ... acquire substantial populations of barnacles." The crabs, even in strong tidal currents, have plenty of barnacles on their shells.

(E) They shed away their shells frequently, and this is why the young crabs hold little barnacles on their shells.
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 [#permalink] New post 17 Oct 2005, 07:16
go E go....
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 [#permalink] New post 17 Oct 2005, 11:33
E.
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 [#permalink] New post 17 Oct 2005, 11:40
OA is E indeed. good job.
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  [#permalink] 17 Oct 2005, 11:40
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Q33: In order to withstand tidal currents, juvenile

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