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European green crabs are an invasive species which have

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European green crabs are an invasive species which have recently colon [#permalink]

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European green crabs are an invasive species which have recently colonized the Northwest coast of North America, among other places. They disrupt ecosystems and prey heavily on native shellfish. However, in Europe, the population of green crabs is kept relatively low by a parasitic barnacle called Sacculina carcini. This barnacle is hardy and could likely be introduced to areas where the European green crab threatens to ruin established ecosystems.

Which of the following, if true, most strongly supports the argument that it would NOT be advisable to attempt to eliminate European green crabs from the Northwest coast of North America by introducing to the area the parasitic barnacle discussed above?

A: In their native habitat, the parasites often threaten the elimination of local green crab populations.
B: European green crabs are also occasionally preyed upon by fishes, gulls and other species of crab in their native ecosystems.
C: Though the parasite may survive in North American waters, no large-scale facility for breeding and harvesting the parasites exists as of yet.
D: Many other invasive species on the Northwest coast of North America are not suitable hosts for this parasite.
E: Though the barnacle cannot reproduce inside of native shore crabs, it can still infect and kill native shore crabs.
[Reveal] Spoiler: OA

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Last edited by abhimahna on 23 Jul 2017, 10:06, edited 1 time in total.
Formatted the question.

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Re: European green crabs are an invasive species which have recently colon [#permalink]

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+1 E

Between A and E. But I choose E because it is a negative effect of the proposed plan.
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Re: European green crabs are an invasive species which have recently colon [#permalink]

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Hi!

When you're not sure about the original explanation, it's very helpful for you to post the source and the explanation with which you disagree.

That said, I'm happy to comment on the question. (E) should indeed be the correct answer.

Step 1 of the Kaplan Method for CR: Identify the Question

When you have a complicated question stem, as is the case here, it's worth spending a bit of extra time to make sure you understand what the question is asking; after all, if you misinterpret the question, you're already in big trouble.

Quote:
Which of the following, if true, most strongly supports the argument that it would NOT be advisable to attempt to eliminate European green crabs from the Northwest coast of North America by introducing to the area the parasitic barnacle discussed above?


We see "Which of the following most strongly supports" and we think "strengthening". However, we want to support that course of action is "NOT... advisable". In other words, we want to weaken that course of action.

So, paraphrasing the question:

Quote:
Which of the following is a reason NOT to introduce the parasitic barnacle?


OK - that's much simpler.

Step 2 of the Kaplan Method for CR: Untangle the Stimulus

For weakening questions, we usually have to deconstruct the entire argument. However, this question is so specific that we can probably avoid doing so. We still need to read the stimulus to put the question stem in context, so let's paraphrase as we go:

Quote:
Green crabs invaded NW of North America; green crabs bad! Barnacle eats green crabs. We should introduce barnacle into NW North America to eat bad crabs.


Step 3 of the Kaplan Method for CR: Make a Prediction

We see that the author has a plan to fight the green crab invasion. To weaken a plan or proposal, we usually look for either an obstacle to the plan working or an undesirable side effect of the plan. So, with that prediction in mind, let's go to the last step:

Step 4 of the Kaplan Method for CR: Attack the Choices

Since we have a prediction, we go through the choices aggressively looking for a match.

(A) I'm not even sure I understand this choice (was it reproduced correctly?). However, here's the good news: it definitely doesn't match our prediction, so we can ignore it and move on.

(B) Not a reason why the plan won't work or a negative effect of the plan - move on.

(C) Not a reason why the plan won't work or a negative effect of the plan - move on.

(D) Not a reason why the plan won't work or a negative effect of the plan - move on.

(E) Ding! (E) tells us that the barnacle can kill off native species - definitely an undesirable side effect. (E) is the GMAT equivalent of there was an old lady who swallowed a fly. Choose (E)!

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Re: European green crabs are an invasive species which have recently colon [#permalink]

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Thanks for the explanations, skovinsky.
My confusion originated from the use of "native crabs" in E.
If crabs are destroyed, won't that be in line with the plan?

However, I think the answers resides in a distinction between "European
green crabs" and the "native shore crabs."
In other words, the native shore crabs are beneficial, while their European
green counterparts are "bad." Destroying the native crabs will result to an
unintended effect.

Hope my explanation is correct?
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Re: European green crabs are an invasive species which have recently colon [#permalink]

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New post 12 Dec 2010, 16:05
gmatbull wrote:
Thanks for the explanations, skovinsky.
My confusion originated from the use of "native crabs" in E.
If crabs are destroyed, won't that be in line with the plan?

However, I think the answers resides in a distinction between "European
green crabs" and the "native shore crabs."
In other words, the native shore crabs are beneficial, while their European
green counterparts are "bad." Destroying the native crabs will result to an
unintended effect.

Hope my explanation is correct?


Correct!

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Re: European green crabs are an invasive species which have recently colon [#permalink]

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New post 12 Dec 2010, 16:10
This argument describes a European crab that is invading North American coastal waters. It notes that a parasite controls the populations of such crabs in Europe and suggests the parasite could be introduced to control invasive populations in North America.

We are asked to find a reason why it would not be a good idea to introduce this parasite. The correct answer should provide some reason why the parasite would be ineffective at controlling the crab population, or provide some undesirable, unconsidered effect of introducing the parasite.

Choice E notes that the parasite can "infect and kill" native shore crabs. The parasite is being introduced to protect native species; if, instead, the parasite kills them, the native ecosystem is not protected. Choice E is correct.

Choice A: Opposite. This choice states that the parasites often "threaten the elimination" of local crab populations in Europe. Such a statement suggests that the parasite would be highly effective in destroying the invasive green crabs in North America. This choice argues for, not against, introducing the parasite.

Choice B: Irrelevant. This choice states that other predators also control the population of green crabs in Europe. This might suggest that parasites alone may be less effective at controlling the green crabs than parasites AND other predators, but it does not demonstrate that parasites alone would not lower the crab population.

Choice C states a logistical obstacle to the plan; there is not currently a facility which can breed large numbers of the parasite. While this may make the plan difficult to execute, it does not mean the plan is not advisable.

Choice D: Irrelevant. This choice suggests that other invasive species would not be affected by the parasite. This has no bearing on whether the parasite would control the population of green crabs.
The correct answer is E.

SOURCE: GMATCLUBTESTS ("KNEWTON CR" PART)
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Re: European green crabs are an invasive species which have recently colon [#permalink]

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New post 12 Dec 2010, 16:31
choice between A and E. I chose E because in A it talk about native habitat and the native habitat is Europe and not North America. So its wrong. and E is right

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Re: European green crabs are an invasive species which have recently colon [#permalink]

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New post 12 Dec 2010, 21:49
Its between A & E -

A - says it threatens the elimination of native crabs

E - confirms the killing of small native crabls

Ans - E
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Re: European green crabs are an invasive species which have recently colon [#permalink]

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New post 13 Dec 2010, 06:47
gmatbull wrote:
Thanks for the explanations, skovinsky.
My confusion originated from the use of "native crabs" in E.
If crabs are destroyed, won't that be in line with the plan?

However, I think the answers resides in a distinction between "European
green crabs" and the "native shore crabs."
In other words, the native shore crabs are beneficial, while their European
green counterparts are "bad." Destroying the native crabs will result to an
unintended effect.

Hope my explanation is correct?


This tripped me up too. But now I see my error.

E is the obvious choice once I realized that.

Thanks
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European green crabs are an invasive species which have [#permalink]

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European green crabs are an invasive species which have recently colonized the Northwest coast of North America, among other places. They disrupt ecosystems and prey heavily on native shellfish. However, in Europe, the population of green crabs is kept relatively low by a parasitic barnacle called Sacculina carcini. This barnacle is hardy and could likely be introduced to areas where the European green crab threatens to ruin established ecosystems.

Which of the following, if true, most strongly supports the argument that it would NOT be advisable to attempt to eliminate European green crabs from the Northwest coast of North America by introducing to the area the parasitic barnacle discussed above?

(C) 2008 GMAT Club - s92#24

A) In their native habitat, the parasites often threaten the elimination of local green crab populations.
B) European green crabs are also occasionally preyed upon by fishes, gulls and other species of crab in their native ecosystems.
C) Though the parasite may survive in North American waters, no large-scale facility for breeding and harvesting the parasites exists as of yet.
D) Many other invasive species on the Northwest coast of North America are not suitable hosts for this parasite.
E) Though the barnacle cannot reproduce inside of native shore crabs, it can still infect and kill native shore crabs.

Can somebody pls explain?

Last edited by Abhishek009 on 06 Jun 2016, 08:37, edited 1 time in total.
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Re: European green crabs are an invasive species which have [#permalink]

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New post 22 Dec 2010, 05:35
E) Though the barnacle cannot reproduce inside of native shore crabs, it can still infect and kill native shore crabs.
E is the best answer .It gives a reason why we should not introduce the barnacle in America.
C is not strong enough
A,We dont know which region does the barnacle belong to ?
If it is a native of Europe then there is a chance that the Barnacle is harmful only to the European green crabs which are a native of Europe if we go by the name.
The rest are out of scope
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New post 22 Dec 2010, 08:36
Definitely (E), since it leads to undesirable consequences which is not advisable.

A) In their native habitat, the parasites often threaten the elimination of local green crab populations -> Not related to Northwest coast of North America
B) European green crabs are also occasionally preyed upon by fishes, gulls and other species of crab in their native ecosystems. -> But this does not control their population
C) Though the parasite may survive in North American waters, no large-scale facility for breeding and harvesting the parasites exists as of yet. --> Out of scope
D) Many other invasive species on the Northwest coast of North America are not suitable hosts for this parasite. --> We are dealing with European green crabs so out of scope
E) Though the barnacle cannot reproduce inside of native shore crabs, it can still infect and kill native shore crabs. --> Leads to other destructive consequences which is not advisable.

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Re: European green crabs are an invasive species which have [#permalink]

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New post 23 Dec 2010, 01:52
I got this wrong then.However what do u mean by "native habitat".If the crabs are incroduced in the American waters the crabs still remain native to their original habitat which could be anywhere but not america
The kangaroo even when lodged in India remains a native of Australia.
???
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Re: European green crabs are an invasive species which have [#permalink]

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Typo in the OA is suppose. Check this european-green-crabs-are-an-invasive-species-106189.html
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Re: European green crabs are an invasive species which have [#permalink]

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New post 23 Dec 2010, 04:59
mailnavin1 wrote:
Typo in the OA is suppose. Check this european-green-crabs-are-an-invasive-species-106189.html

Thanks I feel much better
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Re: European green crabs are an invasive species which have recently colon [#permalink]

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New post 17 Aug 2011, 08:06
sorry, but i still have my thoughts.
i choose C because it's a disadvntage(no breeding=no ability to stop the crub's growth), but the explanation is that E is better. i have seen the explanations andthey resides on the differences between Native Crabs/NC (in e) and European Crubs/EC(in stem).
but, why do u have to care about NC?i need to control EC!!. how do i know that NC is not bad as the EC and why the affect on NC is important?
thank's

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Re: European green crabs are an invasive species which have recently colon [#permalink]

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New post 30 Aug 2012, 08:17
so the jargons used here does the trick here
native crab differ from netshell crab

good question it actually implies the importance of concentration in gmat
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Re: European green crabs are an invasive species which have recently colon [#permalink]

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New post 20 Jul 2014, 01:45
gmatbull wrote:
Thanks for the explanations, skovinsky.
My confusion originated from the use of "native crabs" in E.
If crabs are destroyed, won't that be in line with the plan?

However, I think the answers resides in a distinction between "European
green crabs" and the "native shore crabs."
In other words, the native shore crabs are beneficial, while their European
green counterparts are "bad." Destroying the native crabs will result to an
unintended effect.

Hope my explanation is correct?



In that case even option a suggests local crabs

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European green crabs are an invasive species which have recently colonized the Northwest coast of North America, among other places. They disrupt ecosystems and prey heavily on native shellfish. However, in Europe, the population of green crabs is kept relatively low by a parasitic barnacle called Sacculina carcini. This barnacle is hardy and could likely be introduced to areas where the European green crab threatens to ruin established ecosystems.

Which of the following, if true, most strongly supports the argument that it would NOT be advisable to attempt to eliminate European green crabs from the Northwest coast of North America by introducing to the area the parasitic barnacle discussed above?

A. In their native habitat, the parasites often threaten the elimination of local green crab populations.

B. European green crabs are also occasionally preyed upon by fishes, gulls and other species of crab in their native ecosystems.

C. Though the parasite may survive in North American waters, no large-scale facility for breeding and harvesting the parasites exists as of yet.

D. Many other invasive species on the Northwest coast of North America are not suitable hosts for this parasite.

E. Though the barnacle cannot reproduce inside of native shore crabs, it can still infect and kill native shore crabs.
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