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The gill lining of lobsters in which the disease-causing parasite

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The gill lining of lobsters in which the disease-causing parasite [#permalink]

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The gill lining of lobsters in which the disease-causing parasite An. haemophila resides is completely regenerated every 30 days. The An. haemophila parasite typically produces moderate discoloration of the gills of infected lobsters, and can occasionally lead to more chronic symptoms. However, because these parasites cannot transfer directly from infected gill lining to newly generated gill lining in their host lobster, any discoloration appearing on the gills of lobsters more than 30 days after they have been moved to parasite-free water is not due to infection by An. haemophila.

Which of the following, if true, would most weaken the argument above?

(A) Other parasites are found more frequently in lobsters than An. haemophila.

(B) Lobsters that remain in parasite-rich waters can be re-infected by new An. haemophila parasites once newly generated gill lining
has been produced.

(C) An. haemophila can also cause digestive and respiratory distress in infected lobsters.

(D) In some cases An. haemophila migrates from the gill lining to the stomach, where it can then re-infect its original host.

(E) Once infected by a particular parasite, lobsters frequently develop a strong immunity to that parasite allowing them to better resist re-infection.

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Re: The gill lining of lobsters in which the disease-causing parasite [#permalink]

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New post 07 Aug 2017, 11:09
I was between B and D and chose B. Can someone explain why B is wrong?

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Re: The gill lining of lobsters in which the disease-causing parasite [#permalink]

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New post 07 Aug 2017, 13:46
pra1785 wrote:
I was between B and D and chose B. Can someone explain why B is wrong?


The passage is concerned about lobsters that move in parasite free waters. Lobsters that stay back in parasite rich waters are out of scope. So B is wrong. To Weaken the passage we need something that would reinfect lobster. Option D just does that.

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Re: The gill lining of lobsters in which the disease-causing parasite   [#permalink] 07 Aug 2017, 13:46
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The gill lining of lobsters in which the disease-causing parasite

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