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# Ornithologist: The curvature of the claws of modem tree-dwelling birds

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Ornithologist: The curvature of the claws of modem tree-dwelling birds  [#permalink]

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02 Jul 2018, 05:54
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Question Stats:

51% (01:58) correct 49% (01:54) wrong based on 307 sessions

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Ornithologist: The curvature of the claws of modem tree-dwelling birds enables them to perch in trees. The claws of Archeopteryx, the earliest known birdlike creature, show
similar curvature that must have enabled the creature to perch on tree limbs. Therefore, Archeopteryx was probably a tree‑dwelling creature.

Paleontologist: No, the ability to perch in trees is not good evidence that Archeopteryx was a tree‑dwelling bird. Chickens also spend time perched in trees, yet chickens are primarily ground‑dwelling.

Which one of the following is an assumption on which the ornithologist’s reasoning depends?

(A) Modem tree‑dwelling birds are the direct descendants of Archeopteryx.

(B) Archeopteryx made use of the curvature of its claws.

(C) There have never been tree‑dwelling birds without curved claws.

(D) Archeopteryx was in fact the earliest birdlike creature.

(E) The curvature of the claws is the only available evidence for the claim that Archeopteryx was tree‑dwelling.

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Re: Ornithologist: The curvature of the claws of modem tree-dwelling birds  [#permalink]

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09 Jul 2018, 12:46
+1 for B.

Stimulus :
Archaeopteryx was tree-dwelling, and was involved perching in trees by making use of the curvature of its claws.

(B) Archeopteryx made use of the curvature of its claws. --> Correct, Negate the statement and see how it affects the conclusion

Hence, B.
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Re: Ornithologist: The curvature of the claws of modem tree-dwelling birds  [#permalink]

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09 Jul 2018, 18:03
Hi,

A) No such relationship is mentioned.
B) Correct If you negate this assumption, the ornithologist’s argument falls apart.
C) The ornithologist’s argument says that the curved claws enabled the Archeopteryx to sit on trees, this option uses the reverse logic. You can also use the negation test to see that even if there are tree dwelling birds with curved claws, the argument still stands.
D) Does not make a difference to the reasoning.
E) Does not make a difference to the reasoning.
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Re: Ornithologist: The curvature of the claws of modem tree-dwelling birds  [#permalink]

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10 Jul 2018, 10:35
Quote:
Ornithologist: The curvature of the claws of modem tree-dwelling birds enables them to perch in trees. The claws of Archeopteryx, the earliest known birdlike creature, show
similar curvature that must have enabled the creature to perch on tree limbs. Therefore, Archeopteryx was probably a tree‑dwelling creature.

Paleontologist: No, the ability to perch in trees is not good evidence that Archeopteryx was a tree‑dwelling bird. Chickens also spend time perched in trees, yet chickens are primarily ground‑dwelling.

Which one of the following is an assumption on which the ornithologist’s reasoning depends?

(A) Modem tree‑dwelling birds are the direct descendants of Archeopteryx.

(B) Archeopteryx made use of the curvature of its claws.

(C) There have never been tree‑dwelling birds without curved claws.

(D) Archeopteryx was in fact the earliest birdlike creature.

(E) The curvature of the claws is the only available evidence for the claim that Archeopteryx was tree‑dwelling.

Approach -
1) Eliminate A --> out of scope
2) Negating B --> destroys the argument. Therefore, B is correct
3) Eliminate C --> doesn't exclude the possibility that "not tree dwelling but have curved claws"
4) Eliminate D --> out of scope
5) Eliminate E --> negating implies something else other than curved claws can also lead to tree dwelling.
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Re: Ornithologist: The curvature of the claws of modem tree-dwelling birds  [#permalink]

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04 Aug 2019, 23:53
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Ornithologist: The curvature of the claws of modem tree-dwelling birds   [#permalink] 04 Aug 2019, 23:53