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After a number of migrant fishermen at the Rotunda Beach

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After a number of migrant fishermen at the Rotunda Beach [#permalink] New post 20 Jan 2013, 23:07
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After a number of migrant fishermen at the Rotunda Beach pier got sick from consuming locally fished hermit crabs, the Rotunda Beach city authorities posted signs cautioning against the consumption of the crabs. Tests revealed that the crabs were high in prestic acid, a dangerous chemical. But a marked decline in the number of goldfish found by the beach has led to the removal of the warning signs.

Which of the following, if true, would best explain the removal of the signs?

Goldfish found off Rotunda Beach cause hermit crabs to excrete prestic acid.
The amount of prestic acid produced by an individual goldfish has a direct positive correlation with the density of the goldfish population in that goldfish’s immediate vicinity.
Goldfish consume various parasites that often contain prestic acid.
Rotunda Beach is notoriously polluted.
Goldfish would not be able to inhabit the waters off Rotunda Beach if those waters were not saturated with a precise mixture of acids, including prestic acid.
Source: Veri Prep
[Reveal] Spoiler: OA

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Senior Manager
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Re: After a number of migrant fishermen at the Rotunda Beach [#permalink] New post 29 Jan 2013, 07:08
targetgmatchotu wrote:
After a number of migrant fishermen at the Rotunda Beach pier got sick from consuming locally fished hermit crabs, the Rotunda Beach city authorities posted signs cautioning against the consumption of the crabs. Tests revealed that the crabs were high in prestic acid, a dangerous chemical. But a marked decline in the number of goldfish found by the beach has led to the removal of the warning signs.

Which of the following, if true, would best explain the removal of the signs?

Goldfish found off Rotunda Beach cause hermit crabs to excrete prestic acid.
The amount of prestic acid produced by an individual goldfish has a direct positive correlation with the density of the goldfish population in that goldfish’s immediate vicinity.
Goldfish consume various parasites that often contain prestic acid.
Rotunda Beach is notoriously polluted.
Goldfish would not be able to inhabit the waters off Rotunda Beach if those waters were not saturated with a precise mixture of acids, including prestic acid.
Source: Veri Prep


Nice question !!!
my choices were narrowed down to A and B. i can't figure out which one is correct ?!
can someone plz shed some light about this question ..
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Re: After a number of migrant fishermen at the Rotunda Beach [#permalink] New post 29 Jan 2013, 13:23
I'm not shy to say that I quite did not understand this one. Experts please !!
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Re: After a number of migrant fishermen at the Rotunda Beach [#permalink] New post 29 Jan 2013, 20:14
IMO: A
Premise 1: Eating the hermit crabs, fishermen got sick. So, Authorities displayed warning sign to forbid from eating crabs.
Premise 2: Crabs were acidic chemical prestic acid.
Conclusion: Authorities removed warning signal knowing decline in the goldfish population.

A) Goldfish found off Rotunda Beach cause hermit crabs to excrete prestic acid. Fishermen got sick by eating crab, whose excreta was acidic because of presence of goldfish around. Its good correlation. Now, As goldfish population has declined, it's correct to assume, crabs will not excrete prestic acid.
B) The amount of prestic acid produced by an individual goldfish has a direct positive correlation with the density of the goldfish population in that goldfish’s immediate vicinity. Prestic acid is proportional to goldfish population? then why fishermen felt sick by eating crab. They didn't eat goldfish. Wrong. No correlation with hermit crabs.
C) Goldfish consume various parasites that often contain prestic acid. Same error as B.
D) Rotunda Beach is notoriously polluted. Out of scope. Pollution has no interrelation with crabs and fishes.
E) Goldfish would not be able to inhabit the waters off Rotunda Beach if those waters were not saturated with a precise mixture of acids, including prestic acid. Same error as B,C

I am not convinced with OA. Can anyone please put light on this ?
Director
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Re: After a number of migrant fishermen at the Rotunda Beach [#permalink] New post 29 Jan 2013, 21:21
After a number of migrant fishermen at the Rotunda Beach pier got sick from consuming locally fished hermit crabs, the Rotunda Beach city authorities posted signs cautioning against the consumption of the crabs. Tests revealed that the crabs were high in prestic acid, a dangerous chemical. But a marked decline in the number of goldfish found by the beach has led to the removal of the warning signs.

Premise: High prestic Acid in Hermit crab =>People got sick => Caution signs against Hermit Crabs
Conclusion: Decline in GF => Removal of signs.

Now how does conclusion is linked with premise in the stimulus , is what we have to answer .Because conclusion mentions GF and premise mentions HC.So there must be some relation between GF and prestic acid.

Which of the following, if true, would best explain the removal of the signs?


Goldfish found off Rotunda Beach cause hermit crabs to excrete prestic acid.
This shows that signs shouldn't be removed because GF decline =>HC will less excrete prestic acid => People Sick
The amount of prestic acid produced by an individual goldfish has a direct positive correlation with the density of the goldfish population in that goldfish’s immediate vicinity.
If Density of GF directly proportional to the Prestic acid , the according to conclusion
GF decline => Density of GF declines => Less Prestic acid => HC safe =>People will not get sick => Removal of signs.

Goldfish consume various parasites that often contain prestic acid.
Out of scope, we talking about Acid not parasites
Rotunda Beach is notoriously polluted.
Out of scope
Goldfish would not be able to inhabit the waters off Rotunda Beach if those waters were not saturated with a precise mixture of acids, including prestic acid.
Not related to argument

Hope it helps !!!
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Re: After a number of migrant fishermen at the Rotunda Beach   [#permalink] 29 Jan 2013, 21:21
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