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In order to withstand tidal currents, juvenile horseshoe

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

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New post 10 Jul 2017, 13:34
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Re: In order to withstand tidal currents, juvenile horseshoe  [#permalink]

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New post 04 Mar 2018, 03:28
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.


(A) Tidal currents do not themselves dislodge barnacles from the shells of horseshoe crabs. We already know this. Its burrowing that dislodges barnacles from the shells of horseshoe crabs and not tidal currents. So this does not help is explain the surprising findings
(B) Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest. This is an opposite answer.
If this were to be true, we would expect more barnacles not less.

(C) The strength of the tidal currents in a given location varies widely over the course of a day. Well the strength of the tidal current is out of scope.
(D) A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food. Well decrease in the ability of horseshoe crab to find food when they have a very large portion is not part of this argument
(E) Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year. This gives us the reason why juvenile horseshoe crabs are found not to have significant barnacle populations, even though they seldom burrow. Whenever the crabs shed their shells the barnacles are dislodged from their bodies.
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Re: In order to withstand tidal currents, juvenile horseshoe  [#permalink]

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New post 05 May 2018, 23:19
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 (Factset 1). 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(Factset 2).

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

Additional:
1.IN Resolve Paradox type questions we need a option which shows a connection between Factset1 and Factset2
2.surprising finding should be related to juvenile horseshoe crabs


(A) Tidal currents do not themselves dislodge barnacles from the shells of horseshoe crabs.
No:Nothing about juvenile horseshoe crabs
(B) Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest.
No:Nothing about juvenile horseshoe crabs
(C) The strength of the tidal currents in a given location varies widely over the course of a day.
No:Nothing about juvenile horseshoe crabs
(D) A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food.
No:Nothing about juvenile horseshoe crabs,no reason about thinking of food so its irrelevant.
(E) Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year.
Yes:exactly does what we mentioned in the addition points.
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Re: In order to withstand tidal currents, juvenile horseshoe  [#permalink]

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New post 03 Dec 2018, 23:16
OFFICIAL EXPLANATION:


Argument Construction

Situation - Juvenile horseshoe crabs withstand tidal currents by burrowing in the sand.
This action makes barnacles less likely to cling to their shells. Adult horseshoe crabs can
withstand currents, so they do not burrow, and barnacles become more likely to cling to
their shells. Surprisingly, however, juvenile horseshoe crabs that do not burrow, because
tidal currents do not threaten them, do not have significant numbers of barnacles clinging
to their shells.

Reasoning - What would most help explain the finding that nonburrowing juvenile
horseshoe crabs do not have significant barnacle populations? The finding suggests that
there is some way in which nonburrowing juvenile horseshoe crabs either discourage
barnacles from clinging to their shells, or get rid of the barnacles that do cling to their
shells. Identifying how this is accomplished will explain the finding.

A. This gives a reason why juvenile horseshoe crabs that do not burrow would have
significant barnacle populations.

B. If barnacles in areas of weak tidal currents readily attach themselves to horseshoe
crabs, then it would be more likely for juvenile horseshoe crabs in such areas to
have significant barnacle populations.

C. The areas under discussion are those where tidal currents are very weak. The
strength of currents may vary widely there, but presumably they are still weak
compared to other areas.

D. The surprising finding under discussion is why certain juvenile horseshoe crabs do
not have significant barnacle populations, despite failing to engage in behavior that
dislodges barnacles. That a very large barnacle population can hurt a horseshoe crab
does not help explain such a finding.

E. Correct. This statement properly identifies something that helps explain the
surprising finding: If juvenile horseshoe crabs regularly shed their shells, they also
regularly shed the barnacles that cling to those shells. Thus juvenile horseshoe
crabs would most likely be found not to have significant barnacle populations.

The correct answer is E.
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Re: In order to withstand tidal currents, juvenile horseshoe  [#permalink]

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New post 27 Dec 2018, 01:52
is there any strategy here, as I get completely lost reading this, and couldn't relate to the answers much as I couldn't understand this. should I just take a wild guess a move on?
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Re: In order to withstand tidal currents, juvenile horseshoe  [#permalink]

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New post 27 Dec 2018, 01:53
is there any strategy here, as I get completely lost reading this, and couldn't relate to the answers much as I couldn't understand this. should I just take a wild guess a move on?
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Re: In order to withstand tidal currents, juvenile horseshoe &nbs [#permalink] 27 Dec 2018, 01:53

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