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# #Top150 CR: After a number of migrant fishermen at the Rotunda Beach

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#Top150 CR: After a number of migrant fishermen at the Rotunda Beach  [#permalink]

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12 Oct 2015, 06:47
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95% (hard)

Question Stats:

35% (02:09) correct 65% (02:05) wrong based on 218 sessions

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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?

A. Goldfish found off Rotunda Beach cause hermit crabs to 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.

C. Goldfish consume various parasites that often contain prestic acid.

D. Rotunda Beach is notoriously polluted.

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

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Re: #Top150 CR: After a number of migrant fishermen at the Rotunda Beach  [#permalink]

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12 Oct 2015, 07:39

Reduction of Goldfish led removal of the signs. That means reduction in Goldfish has something to do with the reduction in prestic acid. If Goldfish needs prestic acid for survival then reduction of it will lead to decline in Goldfish population. And when there is less prestic acid in water, crabs will also have less prestic acid and could be recommended for consumption. This is mentioned in choice ‘E’
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#Top150 CR: After a number of migrant fishermen at the Rotunda Beach  [#permalink]

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12 Oct 2015, 08:02
souvik101990 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?

A. Goldfish found off Rotunda Beach cause hermit crabs to 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.

C. Goldfish consume various parasites that often contain prestic acid.

D. Rotunda Beach is notoriously polluted.

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

I was confused between E and B and A.

A. Goldfish found off Rotunda Beach cause hermit crabs to excrete prestic acid. Here, Goldfish OFF the beach not BY the beach cause hermit crabs to excrete prestic acid. So if the population has gone down. Crabs wont excrete but they would still contain prestic acid. So A is out

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 Hmm this one felt tricky. Okay suppose the mixture contains 5% P acid. Now, there is 4% P acid and G fish can't survive without 5% P acid, BUT Acid still remains in the water for the crabs to intake, hence E is out.

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. Now, if this correlation is correct, i.e. Amt of P acid ---> dependent on amt/density of pop of G fish, then Less G ---> Less P. So B seems legit

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Re: #Top150 CR: After a number of migrant fishermen at the Rotunda Beach  [#permalink]

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12 Oct 2015, 09:16
A. Goldfish found off Rotunda Beach cause hermit crabs to excrete prestic acid.
Its only telling us that Goldfish is on our side. It helps in reducing prestic acid's level in the crabs. But why should the warning signs be removed?

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.
This doesnt talk about crabs at all. Though Goldfish is important, we need to assure that crabs are not consumed. Doesn't help

C. Goldfish consume various parasites that often contain prestic acid.
This makes things worse! If this is the case, Goldfish can eat as many crabs as it wants now. As a result it should grow in number.

D. Rotunda Beach is notoriously polluted.
So what? Way out of scope!

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
This makes sense.
Please note- precise mixture of acids is needed for the Goldfish to survive.
Now, Since the warning signs were put up, the levels of prestic acid must have gone up because of the unchallenged growth of crabs, thereby going beyond whats needed by our Goldfish. So, remove the warning so that the crabs are again hunted and level of prestic acid comes down.

Hence, ill go with E.

But hold on! We are saving Goldfish at the expense of our fishermen's health!!
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Re: #Top150 CR: After a number of migrant fishermen at the Rotunda Beach  [#permalink]

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12 Oct 2015, 09:43
The argument: consuming hermit crabs makes people got sick => authorities posted warning sign
Hermit crab excrete prestic acid which is toxic to human
The conclusion: Decline number of GF found off the beach => remove sign of caution

Scope: Hermit crab, prestic acid need connect to reasons of decline of GF

souvik101990 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?

A. Goldfish found off Rotunda Beach cause hermit crabs to excrete prestic acid. => Reverse answer

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.
=> out of scope. We need about prestic acid of GF
C. Goldfish consume various parasites that often contain prestic acid.
=> Irrelevant
D. Rotunda Beach is notoriously polluted.
=> Irrelevant
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
=> The most correct answer. Because GF cannot inhabit in the water off RB where certain mixture of acid restrain GF's population. Caution sign should be removed for people to fish the hermit crab

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Re: #Top150 CR: After a number of migrant fishermen at the Rotunda Beach  [#permalink]

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12 Oct 2015, 09:57
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?

A. Goldfish found off Rotunda Beach cause hermit crabs to excrete prestic acid.
(If Goldfish causes crabs to excrete acid then their present should reduce prestic acid and cause removal of warning signs.
but instead their absence seemingly resulted in the same. This further exacerbates the paradox adding more confusion.)

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.
(if goldfish population amount of prestic acid
then decline in gold population indicates decline in the amount of prestic acid.
that is the reason why warning signs against eating crabs is removed since the amount of prestic acid reduce considerably.

C. Goldfish consume various parasites that often contain prestic acid.
this does not explain why it is acceptable to eat crabs now.

D. Rotunda Beach is notoriously polluted.
This does not provide any useful information.

E. Goldfish would not be able to live in the waters off Rotunda Beach if those waters were not saturated with a precise mixture of acids, including prestic acid
(This is a double negative.
This means that If those waters are saturated with mixture of acids including prestic acid then Gold fish can live in waters off Beach.
so if Gold fish is decreasing then those mixture of acids is decreasing in content.
but
mixture of acids is not the same as prestic acid as it is possible that the mixture of acids may not be as harmful as prestic acd.
since we don't have info whether mixture is as harmful or harmless compared to prestic acid, we cannot infer any info which relates this info to do with crabs infection and removal of warnings.)
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Re: #Top150 CR: After a number of migrant fishermen at the Rotunda Beach  [#permalink]

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13 Dec 2017, 18:45
I think the confusion here is with the line "But a marked decline in the number of goldfish found by the beach has led to the removal of the warning signs." of the question.
What does "by the beach" stands for. Is it "near the beach in the water" or is it "lying dead in and around the beach".
The understanding of this will greatly impact the solution.
Re: #Top150 CR: After a number of migrant fishermen at the Rotunda Beach &nbs [#permalink] 13 Dec 2017, 18:45
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