Paleontologists have discovered fossils of centipedes that : GMAT Critical Reasoning (CR)
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# Paleontologists have discovered fossils of centipedes that

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Paleontologists have discovered fossils of centipedes that [#permalink]

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07 Jun 2005, 16:05
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9. Paleontologists have discovered fossils of centipedes that are 414 million years old. These fossils are at least 20 million years older than the earliest land-dwelling animals previously identified. The paleontologists are confident that these centipedes lived on land, even though the fossilized centipedes were discovered in rock that also contained fossilized remains of animals known to be water-dwelling.
The paleontologistsâ€™ view would be LEAST supported by the truth of which one of the following?

(A) The legs of the fossilized centipedes were particularly suited to being a means of locomotion on land.
(B) All of the centipedes that had previously been discovered were land dwellers.
(C) The rock in which the fossilized centipedes were found was formed from mud flats that were occasionally covered by river water.
(D) Fossils of the earliest land-dwelling animals that had previously been identified were found in rock that did not contain fossilized remains of water-dwelling animals.
(E) Fossils of spiders with respiratory systems adapted only to breathing air were found in the same rock as the centipede fossils.
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08 Jun 2005, 07:02
(D)

Means the centipede fossil will be the first of its kind that was found in rock that did contain water-dwelling animals. other centipedes that were all land dwelling had fossils found in rocks not containing fossilized remains of WD animals. Tends to infact weaken.
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08 Jun 2005, 07:13
D it is.

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17 Jun 2005, 02:55
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17 Jun 2005, 08:59
i go with C.

C talk about how the rocks in which the centipedes were found were formed by water from a river. This option is the one that LEAST supports the argument of the paleontologists who are trying to prove that centipedes were land-dwelling creatures.

i hate being the only one to give a different answer!
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17 Jun 2005, 09:13
I WILL GO WITH D ON THIS.

D IT IS.
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17 Jun 2005, 09:14
I go with 'C' for the reason that leastly supported in the premise. I think "D" strongly supports the premise.
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17 Jun 2005, 12:28
C. Same explaination as given above.
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17 Jun 2005, 12:51
I will go with D

The passage talks about the rock containing fossilized remains of animals know to be water-dwelling, so C can be eliminated.
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18 Jun 2005, 05:22
The OA is D.
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28 Sep 2011, 10:07
Only D has nothing to do with centipedes

OA D.
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28 Sep 2011, 19:42
Why not B? how does it support p's view?
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28 Sep 2011, 21:13
D by POE.

A Highly Supports
B Highly Supports
C Kind of neutral
D -Correct
E- High Support.

Too much Intricate to explain the logic . Figure it out for yourself.
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28 Sep 2011, 21:16
sheru34766 wrote:
Why not B? how does it support p's view?

"paleontologists are confident that these centipedes lived on land" . B supports this. How?

"All of the centipedes that had previously been discovered were land dwellers". This is a strong evidence for paleontogists to be confident that centipedes lived on land.
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Re: Paleontologists have discovered fossils of centipedes that [#permalink]

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25 Dec 2013, 06:22
Paleontologists have discovered fossils of centipedes that are 414 million years old. These fossils are at least 20 million years older than the earliest land-dwelling animals previously identified. The paleontologists are confident that these centipedes lived on land, even though the fossilized centipedes were discovered in rock that also contained fossilized remains of animals known to be water-dwelling.
The paleontologistsâ€™ view would be LEAST supported by the truth of which one of the following?

(A) The legs of the fossilized centipedes were particularly suited to being a means of locomotion on land. Highly Supports
(B) All of the centipedes that had previously been discovered were land dwellers.Highly Supports
(C) The rock in which the fossilized centipedes were found was formed from mud flats that were occasionally covered by river water.
Only contending option with actual answer.. Excerpt from argument: ....are confident that these centipedes lived on land, even though the fossilized centipedes were discovered in rock that ..... water-dwelling. So, if we consider this statement to be true that centipedes were discovered on rock which was shared by water-dwelling animals, then it supports the argument. Isn't it? What we have to realize is that argument and choice C agrees on the type of rock and not the kind of animals.
(D) Fossils of the earliest land-dwelling animals that had previously been identified were found in rock that did not contain fossilized remains of water-dwelling animals.POE can lead to this answer.. But it not only is a standard weakener but also does throw a reasonable suspicion "why is this case different?" Probably these earliest centipedes were living in water and the ones coming later were not.
(E) Fossils of spiders with respiratory systems adapted only to breathing air were found in the same rock as the centipede fossils.Highly Supports
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Re: Paleontologists have discovered fossils of centipedes that [#permalink]

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25 Dec 2013, 12:00
Agree with joshnsit's explanation. I would like to point out another idea to spot the answer to this question.

Paleontologists have discovered fossils of centipedes that are 414 million years old. These fossils are at least 20 million years older than the earliest land-dwelling animals previously identified. The paleontologists are confident that these centipedes lived on land, even though the fossilized centipedes were discovered in rock that also contained fossilized remains of animals known to be water-dwelling.

(D) Fossils of the earliest land-dwelling animals that had previously been identified were found in rock that did not contain fossilized remains of water-dwelling animals.

If this choice is closely observed, it only says that fossils of earliest land-dwelling animals were found in rock that did not contain fossilized remains of water-dwelling animals. Are we concerned about earliest land-dwelling animals or about the properties of the rock on which they are found? No. Any choice that supports the conclusion must talk about the fossils of centipedes and about the rock on which they are found.

If anything this choice weakens the argument but we need not go that deep into the details, after all the question asked us to find the LEAST supporter among the rest.
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Re: Paleontologists have discovered fossils of centipedes that   [#permalink] 25 Dec 2013, 12:00
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