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A plausible explanation of the disappearance of the

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A plausible explanation of the disappearance of the [#permalink]

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25 Aug 2012, 05:01
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A plausible explanation of the disappearance of the dinosaurs is what is known as the comet theory. A large enough comet colliding with Earth could have caused a cloud of dust that enshrouded the planet and cooled the climate long enough to result in the dinosaur's demise.
Which of the following statements, if true, most seriously weakens the argument?
A) One of the various schools of paleontology adheres to an explanation for the disappearance of the dinosaurs that is significantly different from the comet theory.
B) Various species of animals from the same as dinosaurs and similar to them in physiology and habitat did not become extinct when dinosaurs did.
C) It can not be determined from a study of dinosaur skeletons whether the animals died from the effects of a dust cloud.
D) Many other animal species from the era of the dinosaurs did not become extinct at the same time the dinosaurs did.
E) The consequences for the vegetation and animals of comet colliding with Earth are not fully understood.

I found 3 weakeners here owing to causality. Seriously in the predicament. I was hitting immaculate accuracy in Weaken Questions when this hit me.
Let me know the explanations here.. OA to follow soon...
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Last edited by joshnsit on 25 Aug 2012, 17:13, edited 1 time in total.
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Re: Seems like Multiple Weakeners: A plausible explanation of... [#permalink]

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25 Aug 2012, 05:28
Hey....new kid on the block

I would go with B ... This option talks about non extinction of animals from the same species as the dinosaurs ...for me makes sense and weakens the argument

The option D also talks about non extinction of animals of the same era, but these animals are of different species and so might have naturally adapted to the change in environment
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Re: Seems like Multiple Weakeners: A plausible explanation of... [#permalink]

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25 Aug 2012, 05:59
gmatstalker2012 wrote:
Hey....new kid on the block

I would go with B ... This option talks about non extinction of animals from the same species as the dinosaurs ...for me makes sense and weakens the argument

The option D also talks about non extinction of animals of the same era, but these animals are of different species and so might have naturally adapted to the change in environment
B is obviously better than D. But, why couldnt it be A or C then? They also give different causes of dinosaur's death weakening the conclusion.
_________________

If you know what you're worth, then go out and get what you're worth. But you gotta be willing to take the hits, and not pointing fingers saying you ain't where you wanna be because of anybody! Cowards do that and You're better than that!
The path is long, but self-surrender makes it short; the way is difficult, but perfect trust makes it easy.

Fire the final bullet only when you are constantly hitting the Bull's eye, till then KEEP PRACTICING.
Failure establishes only this, that our determination to succeed was not strong enough.
Getting defeated is just a temporary notion, giving it up is what makes it permanent.

http://gmatclub.com/forum/1000-sc-notes-at-one-place-in-one-document-with-best-of-explanations-192961.html

Press +1 Kudos, if you think my post gave u a tiny tip.

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Re: Seems like Multiple Weakeners: A plausible explanation of... [#permalink]

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25 Aug 2012, 08:51
Yes, the answer is B. If dinosaurs would be unable to survive the aftermath of a comet, you'd expect the same to be true of similar animals, so B casts doubt on the theory. As for the other answers you asked about:

A just says "some people don't agree with the comet theory". You can rule those types of answers out right away. Whether a few people disagree with the theory is irrelevant; we need facts to weaken an argument, not opinions.

C just says "studying dinosaur skeletons doesn't help us to evaluate the theory". So skeletons don't give us any information about the comet theory. So C neither strengthens nor weakens the argument. If C instead said that a study of skeletons gives reason to think dinosaurs died from an alternative cause, then C would be a good answer, but that's not what it says.
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Re: Seems like Multiple Weakeners: A plausible explanation of... [#permalink]

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26 Aug 2012, 04:32
IanStewart wrote:
Yes, the answer is B. If dinosaurs would be unable to survive the aftermath of a comet, you'd expect the same to be true of similar animals, so B casts doubt on the theory. As for the other answers you asked about:

A just says "some people don't agree with the comet theory". You can rule those types of answers out right away. Whether a few people disagree with the theory is irrelevant; we need facts to weaken an argument, not opinions.

C just says "studying dinosaur skeletons doesn't help us to evaluate the theory". So skeletons don't give us any information about the comet theory. So C neither strengthens nor weakens the argument. If C instead said that a study of skeletons gives reason to think dinosaurs died from an alternative cause, then C would be a good answer, but that's not what it says.
@IanStewart. Though your comment about choice A makes sense, this info was new to me. To make your statement about choice A explicit, can we safely state that "Any opinion/belief/claim by an authority, whatever the status and credentials of the authority are, can't be used to disprove or raise doubt on author's opinion/belief/claim in an argument." ?
_________________

If you know what you're worth, then go out and get what you're worth. But you gotta be willing to take the hits, and not pointing fingers saying you ain't where you wanna be because of anybody! Cowards do that and You're better than that!
The path is long, but self-surrender makes it short; the way is difficult, but perfect trust makes it easy.

Fire the final bullet only when you are constantly hitting the Bull's eye, till then KEEP PRACTICING.
Failure establishes only this, that our determination to succeed was not strong enough.
Getting defeated is just a temporary notion, giving it up is what makes it permanent.

http://gmatclub.com/forum/1000-sc-notes-at-one-place-in-one-document-with-best-of-explanations-192961.html

Press +1 Kudos, if you think my post gave u a tiny tip.

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Re: Seems like Multiple Weakeners: A plausible explanation of... [#permalink]

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26 Aug 2012, 05:00
No,it doesn't work that way.Its just that the below statement is not strong enough to weaken the author's claim.
"One of the various schools of paleontology adheres to an explanation for the disappearance of the dinosaurs that is significantly different from the comet theory."
Also,in this statement,its just mentioned generally that the explanation differs to author's statement.If something concrete would've been mentioned,say something such as "X theory has stated that disappearance of dinosaurs took place because of Y reason" then we could have selected A.

Hope it helps,
Thanks!
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Re: Seems like Multiple Weakeners: A plausible explanation of... [#permalink]

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26 Aug 2012, 10:43
joshnsit wrote:
@IanStewart. Though your comment about choice A makes sense, this info was new to me. To make your statement about choice A explicit, can we safely state that "Any opinion/belief/claim by an authority, whatever the status and credentials of the authority are, can't be used to disprove or raise doubt on author's opinion/belief/claim in an argument." ?

In this question, A is particularly unhelpful, because all it says is that some people disagree with the theory. That's generally true about most theories. I suppose in a similar question, if one answer said something like "most experts who have researched this issue disagree with the theory", that kind of answer would help to weaken the argument. But for GMAT purposes, I don't think that matters -- I don't think I've ever seen a real GMAT question where that type of 'appeal to universal authority' answer was even among the answer choices. In every real GMAT weakening question I've seen, the correct answer is based on flaws or gaps in the argument itself, and not on the opinions of experts. And whenever I've seen answers that read something like "some people think X", those answers are never correct, because the logical force of an argument is not substantially diminished by the opinions of a few people.
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Re: Seems like Multiple Weakeners: A plausible explanation of...   [#permalink] 26 Aug 2012, 10:43
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