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European green crabs are an invasive species which have

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

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New post 06 Jun 2016, 07:15
gmatbull wrote:
(Am not convinced by the OE given for the problem below.)

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.


Barnacle must be introduced not to destroy the local ecosystem. However, option E states that it can kill native native shore crabs, hence disturbing local ecosystem.

E makes us to believe that idea of introducing barnacle is not justifiable.
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Re: European green crabs are an invasive species which have  [#permalink]

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New post 06 Jun 2016, 08:38
nilboy wrote:
I chose E what is the OA? Please advise with explanation.


(E) is the correct answer ( Updated the OA ) , check discussion on this topic here from some of the experts -

am-not-convinced-by-the-oe-given-for-the-problem-below-106189.html

Hope that Helps...
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Re: European green crabs are an invasive species which have  [#permalink]

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New post 06 Jun 2016, 12:35
E is the answer that would justify "it is not advisable to introduce barnacles" because it states that such introduction would affect the existing eco system!
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Re: European green crabs are an invasive species which have  [#permalink]

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New post 15 Nov 2016, 07:46
prashantbacchewar wrote:
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?


looks like a negative weakener = strengthener....
which one weakens the plan?

A - irrelevant
B - occasionally - not big enough
C - irrelevant. how to implement is not an issue here.
D - this one seems to support the plan
E - barnacle will damage even more the ecosystem.

E seems to be the best option
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Re: European green crabs are an invasive species which have recently colon  [#permalink]

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New post 23 Jul 2017, 09:59
Clearly E.

The ecosystem will be disturbed as the parasite will attack the green crab as well as native crab species.
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Re: European green crabs are an invasive species which have  [#permalink]

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New post 26 Jul 2017, 08:45
Merged topics. Please, search before posting questions!
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Re: European green crabs are an invasive species which have  [#permalink]

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New post 02 Dec 2017, 14:41
Mahmud6, broall
what is the source of this question? Thank you.

To test takers,
A: In their native habitat, the parasites often threaten the elimination of local green crab populations. -> out of scope
B: European green crabs are also occasionally preyed upon by fishes, gulls and other species of crab in their native ecosystems. -> out of scope
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. -> weaken
E: Though the barnacle cannot reproduce inside of native shore crabs, it can still infect and kill native shore crabs.
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Re: European green crabs are an invasive species which have  [#permalink]

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New post 03 Dec 2017, 02:12
chesstitans wrote:
Mahmud6, broall
what is the source of this question? Thank you.

To test takers,
A: In their native habitat, the parasites often threaten the elimination of local green crab populations. -> out of scope
B: European green crabs are also occasionally preyed upon by fishes, gulls and other species of crab in their native ecosystems. -> out of scope
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. -> weaken
E: Though the barnacle cannot reproduce inside of native shore crabs, it can still infect and kill native shore crabs.

Thank you for query.

It seems the poster of this question is no longer active in the forum.

However, if we come across the original source of this question, we will update it in tag-line. :-)
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Re: European green crabs are an invasive species which have  [#permalink]

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New post 04 Dec 2017, 16:58
Mahmud6 wrote:
chesstitans wrote:
Mahmud6, broall
what is the source of this question? Thank you.

To test takers,
A: In their native habitat, the parasites often threaten the elimination of local green crab populations. -> out of scope
B: European green crabs are also occasionally preyed upon by fishes, gulls and other species of crab in their native ecosystems. -> out of scope
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. -> weaken
E: Though the barnacle cannot reproduce inside of native shore crabs, it can still infect and kill native shore crabs.

Thank you for query.

It seems the poster of this question is no longer active in the forum.

However, if we come across the original source of this question, we will update it in tag-line. :-)


I am happy to hear a respond from you. I believe this question comes from Knewton, an unreliable source. (beatgmat and a chinese website says so)
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Re: European green crabs are an invasive species which have &nbs [#permalink] 04 Dec 2017, 16:58

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