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In the late 1980 s, the population of sea otters in the

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Re: In the late 1980 s, the population of sea otters in the [#permalink]

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New post 08 Sep 2010, 21:51
Premise : The number of sea otters has declined.
Premise: The sea lions and seals are affected by pollution related disease

Conclusion: Otters are also affected by the disease and that's the reason of decline in numbers

A states that as there is scarcity of sea lions and seals, the whales are preying the otters.

which weakens the reasoning.
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Re: In the late 1980 s, the population of sea otters in the [#permalink]

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New post 08 Sep 2010, 22:04
this was an easy A...
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Re: In the late 1980 s, the population of sea otters in the [#permalink]

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New post 14 Oct 2010, 23:50
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A seems the best..
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Re: In the late 1980 s, the population of sea otters in the [#permalink]

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New post 23 Oct 2010, 14:25
+1 A
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Re: In the late 1980 s, the population of sea otters in the [#permalink]

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New post 05 Nov 2010, 14:31
A is the only one which closely weakens the QS.

In C...it can be talking about another region around Pacific coast.
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Re: In the late 1980 s, the population of sea otters in the [#permalink]

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New post 11 Nov 2010, 12:29
Hi i disagree with option (a). It states that whales would usually eat the seals, but when this source gets scarce they move to other sources - we can not assume that they'll eat otters.

The otters' population might actually be affected by pollution like the seals and this argument does not weaken that. "Other sources" may or may not be otters.
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Re: In the late 1980 s, the population of sea otters in the [#permalink]

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New post 06 Aug 2012, 21:24
Can anyone tell me vvhat is the conclusion of this argument

vvhat are vve trying to vveaken here could not follovv please

Thanks
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Re: In the late 1980 s, the population of sea otters in the [#permalink]

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New post 01 May 2014, 20:30
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Re: In the late 1980 s, the population of sea otters in the [#permalink]

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New post 31 Jul 2014, 02:18
it is good question indeed, struck between a and C , took a time and then realize

Killer whales in the North Pacific usually prey on seals and sea lions but will,
when this food source is scarce, seek out other prey.--->had killer whales eaten them they would have got infected by disease and would have died , there number does not decrease So A
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Re: In the late 1980 s, the population of sea otters in the [#permalink]

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New post 12 Oct 2015, 06:47
noboru wrote:
In the late 1980’s, the population of sea otters in the North Pacific Ocean began to decline. Of the two plausible explanations for the decline—increased predation by killer whales or disease—disease is the more likely. After all, a concurrent sharp decline in the populations of seals and sea lions was almost certainly caused by a pollution related disease, which could have spread to sea otters, whereas the population of killer whales did not change noticeably

Which of the following, if true, most seriously weakens the reasoning?

A. Killer whales in the North Pacific usually prey on seals and sea lions but will, when this food source is scarce, seek out other prey.
B. There is no indication that substantial numbers of sea otters migrated to other locations from the North Pacific in the 1980’s.
C. Along the Pacific coast of North America in the 1980’s, sea otters were absent from many locations where they had been relatively common in former times.
D. Following the decline in the population of the sea otters, there was an increase in the population of sea urchins, which are sea otters’ main food source.
E. The North Pacific populations of seals and sea lions cover a wider geographic area than does the population of sea otters



hi EMPOWERgmatMax

could you please provide your comments on this. I was between option A and C. I want to know how A is preferable over C?

Regards
Re: In the late 1980 s, the population of sea otters in the   [#permalink] 12 Oct 2015, 06:47

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