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Paleontologists have discovered fossils of centipedes that are

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Paleontologists have discovered fossils of centipedes that are [#permalink]

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New post 05 Oct 2017, 00:38
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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 paleontologists' 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.

Source: LSAT
[Reveal] Spoiler: OA

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Re: Paleontologists have discovered fossils of centipedes that are [#permalink]

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New post 05 Oct 2017, 04:25
Answer is C
The rock on which fossilized centipedes were found was formed from mud flats occasionally covered with river water.So the centipedes were not land dwelling but water dwelling. Please give me kudos. I need them badly to increase my score.

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Re: Paleontologists have discovered fossils of centipedes that are [#permalink]

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I will go with D here :

(C) The rock in which the fossilized centipedes were found was formed from mud flats that were occasionally covered by river water--this actually support the Paleontologists .It says that the rock that has been found was formed from mud flats that were occasionally (not most) covered by river water, so there may be chances , some of the water animals got fossilized...

(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. ---So what , it did not resolve the contention that why this time we have water animal fossilized in rock or Is centipedes are water dwelling ???

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Re: Paleontologists have discovered fossils of centipedes that are [#permalink]

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New post 05 Oct 2017, 10:14
broall wrote:
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 paleontologists' 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.

Source: LSAT


I think the answer is E
Fossils of spiders we re found with respiratory systems suited only to breathe air but this does not tell anything about the centipedes and we can not assume that they also had similar system for breathing.
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Re: Paleontologists have discovered fossils of centipedes that are [#permalink]

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New post 05 Oct 2017, 11:20
confused between D and E but I think I will go with D because option E states the possibility of centipede being land dweller by mentioning that the same rock had a spider fossil which was a land dweller along with centipede fossil and water dwelling animal fossil.

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Paleontologists have discovered fossils of centipedes that are [#permalink]

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New post 17 Oct 2017, 05:03
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 paleontologists' 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. -- This says they were built to be on land, which supports our conclusion

(B) All of the centipedes that had previously been discovered were land dwellers. -- This, again, supports out conclusion based on history

(C) The rock in which the fossilized centipedes were found was formed from mud flats that were occasionally covered by river water. -- This says that fish fossils could have been placed with our creature well after our creature had already been fossilized. Therefore, this supports our conclusion

(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. -- So no other water-dwelling animals were found with other land-dwelling animals. This doesn't 100% weaken our conclusion, but it certainly doesn't support it. This is our answer

(E) Fossils of spiders with respiratory systems adapted only to breathing air were found in the same rock as the centipede fossils. -- This says that air-breathing species were found with our creature. This would support the idea, albeit not well, that our creature was land-dwelling, too. Thus, this supports or conclusion
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Paleontologists have discovered fossils of centipedes that are   [#permalink] 17 Oct 2017, 05:03
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Paleontologists have discovered fossils of centipedes that are

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