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In 1860 Bavarian quarry workers discovered the impression

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In 1860 Bavarian quarry workers discovered the impression [#permalink]

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New post 22 Sep 2017, 07:51
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  15% (low)

Question Stats:

82% (01:41) correct 18% (01:48) wrong based on 51 sessions

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In 1860 Bavarian quarry workers discovered the impression of a feather in a limestone slab dating to the Mesozoic era. It had previously been assumed that birds developed only after the close of the Mesozoic era and after the disappearance of pterosaurs, a species characteristic of that era. But there in limestone lay the imprint of a fully aerodynamic, three-inch-long feather. This, therefore, must have been the earliest bird—certainly, the earliest found to that date.

The argument assumes which one of the following?

(A) The creature to which the feather belonged was a descendant of the pterosaurs.

(B) Birds with such feathers were preceded by species of birds with less-developed feathers.

(C) In the Mesozoic era, no creatures other than birds had such feathers.

(D) The feather belonged to a Mesozoic creature that was neither a pterosaur nor a bird, but an intermediate between them.

(E) The earliest bird flew in an awkward manner.

Source: LSAT
[Reveal] Spoiler: OA

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Kudos [?]: 881 [0], given: 53

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Re: In 1860 Bavarian quarry workers discovered the impression [#permalink]

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broall wrote:
In 1860 Bavarian quarry workers discovered the impression of a feather in a limestone slab dating to the Mesozoic era. It had previously been assumed that birds developed only after the close of the Mesozoic era and after the disappearance of pterosaurs, a species characteristic of that era. But there in limestone lay the imprint of a fully aerodynamic, three-inch-long feather. This, therefore, must have been the earliest bird—certainly, the earliest found to that date.

The argument assumes which one of the following?

(A) The creature to which the feather belonged was a descendant of the pterosaurs.

(B) Birds with such feathers were preceded by species of birds with less-developed feathers.

(C) In the Mesozoic era, no creatures other than birds had such feathers.

(D) The feather belonged to a Mesozoic creature that was neither a pterosaur nor a bird, but an intermediate between them.

(E) The earliest bird flew in an awkward manner.

Source: LSAT


Conclusion: ...this [the creature to which the discovered feather belonged to] must have been the earliest bird - certainly the earliest found to date.

Goal: Our goal here is to check what assumption does the author make to conclude that the feather belonged to the earliest bird from the given premise which says "It had previously been assumed that birds developed only after the close of the Mesozoic era and after the disappearance of pterosaurs, a species characteristic of that era"

A) It doesn't make the argument stronger. Even if the given creature were a descendant of Pterosaurs, it wouldn't have been helpful to conclude what kind of creature was it.

B) This is Out of Scope of the argument. We are not concerned with how developed the feathers were.

C) This, IMO is the correct option. If the author assumes that only birds from the Mesozoic era could have had feathers like the one found by Bavarian workers and no other creatures could have had that feather, it makes the argument stronger. If we refute that, the argument doesn't make sense.

D) If this is assumed, the author couldn't have made the given conclusion with so much certainty.

E) This is out of scope, because the pattern of flying doesn't concern with the feather belonging to a bird or another creature.

Therefore, C is the right answer according to me.


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Kudos [?]: 7 [1], given: 232

Re: In 1860 Bavarian quarry workers discovered the impression   [#permalink] 22 Sep 2017, 08:09
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In 1860 Bavarian quarry workers discovered the impression

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