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# A distemper virus has caused two-thirds of the seal

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Manager
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Re: A distemper virus has caused two-thirds of the seal  [#permalink]

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16 Oct 2016, 17:28
sayantanc2k wrote:
YangYichen wrote:
is there anything to do with "At various times during the last ten years" I mean the past thing can have no effect on present phenomena

Unless the year when the statement is made is known, the phrase "At various times during the last ten years" does not have a role. The sentence would be more meaningful, if it were something like "during the same period".

yeah I agree with u I think the option is just far-fetched
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A distemper virus has caused two-thirds of the seal  [#permalink]

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13 Oct 2017, 00:43
To be honest i chose E

But reading all explanations, i feel A is best choice among all options. Had there been any better option than A, definitely that option would have been the winner, but thats not the case. A is the winner
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Re: A distemper virus has caused two-thirds of the seal  [#permalink]

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14 Oct 2017, 06:05
noboru wrote:
A distemper virus has caused two-thirds of the seal population in the North Sea to die since May 1988. The explanation for the deaths cannot rest here, however. There must be a reason the normally latent virus could prevail so suddenly: clearly the severe pollution of the North Sea waters must have weakened the immune system of the seals so that they could no longer withstand the virus.

Which one of the following, if true, most strongly supports the explanation given in the argument?

(A) At various times during the last ten years, several species of shellfish and seabirds in the North Sea have experienced unprecedented steep drops in population.

(B) By reducing pollution at its source, Northern Europe and Scandinavia have been taking the lead in preventing pollution from reaching the waters of the North Sea.

(C) For many years, fish for human consumption have been taken from the waters of the North Sea.

(D) There are two species of seal found throughout the North Sea area, the common seal and the gray seal.

(E) The distemper caused by the virus was a disease that was new to the population of North Sea seals in May 1988, and so the seals’ immune systems were unprepared to counter it.

Source: LSAT

Same passage with different stem question: LINK

Hi folks ,

I think the answer is A
A virus has caused the seal population to decline in north sea since may 1988 ans the decline was because of the immune system weakened by the severe pollution of the north sea.
This is a very tough problem but A provides a loose hint that strengthens the argument by giving us examples of other animals who also have suffered severe population decline .
Now the severe pollution of the north sea will affect every animal living in the zone and dependent on the north sea .So this is our strengthener

E on the other hand describes a story that does not affect the conclusion of the argument .I tells us that the virus was not native to the north sea and therefore immune system of the seals was not ready to fight the disease.It changes the reasoning of the argument .We may not know if seals will encounter the disease once if they have suffered from the disease .
So it does not strengthen the argument .

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Re: A distemper virus has caused two-thirds of the seal  [#permalink]

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10 Nov 2018, 05:43
Can you please brief on option E ?
Re: A distemper virus has caused two-thirds of the seal &nbs [#permalink] 10 Nov 2018, 05:43

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