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# A distemper virus has caused two-thirds

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A distemper virus has caused two-thirds  [#permalink]

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02 Oct 2017, 21:45
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15% (low)

Question Stats:

80% (01:40) correct 20% (01:40) wrong based on 188 sessions

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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.

The argument concerning the immune system of the seals presupposes which one of the following?

(A) There has been a gradual decline in the seal population of the North Sea during the past two centuries.

(B) No further sources of pollution have been added since May 1988 to the already existing sources of pollution in the North Sea.

(C) There was no sudden mutation in the distemper virus which would have allowed the virus successfully to attack healthy North Sea seals by May 1988.

(D) Pollution in the North Sea is no greater than pollution in the Mediterranean Sea, off the coast of North America, or in the Sea of Japan.

(E) Some species that provide food for the seals have nearly become extinct as a result of the pollution.

Source: LSAT

Same passage with different stem question: LINK

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

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02 Oct 2017, 23:13
broall 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.

The argument concerning the immune system of the seals presupposes which one of the following?

(A) There has been a gradual decline in the seal population of the North Sea during the past two centuries.

(B) No further sources of pollution have been added since May 1988 to the already existing sources of pollution in the North Sea.

(C) There was no sudden mutation in the distemper virus which would have allowed the virus successfully to attack healthy North Sea seals by May 1988.

(D) Pollution in the North Sea is no greater than pollution in the Mediterranean Sea, off the coast of North America, or in the Sea of Japan.

(E) Some species that provide food for the seals have nearly become extinct as a result of the pollution.

Source: LSAT

Same passage with different stem question: LINK

Argument says that the decline in seal population is due to weakening of immune system that allowed virus to attack the seal...Pollution is the main cause for weakening of immune system ..
Negate C , it will point alternate reason for the decline ..
There was sudden mutation in the distemper virus which would have allowed the virus successfully to attack healthy North Sea seals by May 1988.
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Re: A distemper virus has caused two-thirds  [#permalink]

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09 Oct 2017, 23:25
broall 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.

The argument concerning the immune system of the seals presupposes which one of the following?

(A) There has been a gradual decline in the seal population of the North Sea during the past two centuries.

(B) No further sources of pollution have been added since May 1988 to the already existing sources of pollution in the North Sea.

(C) There was no sudden mutation in the distemper virus which would have allowed the virus successfully to attack healthy North Sea seals by May 1988.

(D) Pollution in the North Sea is no greater than pollution in the Mediterranean Sea, off the coast of North America, or in the Sea of Japan.

(E) Some species that provide food for the seals have nearly become extinct as a result of the pollution.

Source: LSAT

Same passage with different stem question: LINK

Negating option C tells us "the virus has mutated and attacked healthy seals" hence this makes the argument to fall.
Re: A distemper virus has caused two-thirds &nbs [#permalink] 09 Oct 2017, 23:25
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# A distemper virus has caused two-thirds

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