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07 Apr 2020, 05:55
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Difficulty:
65%
(hard)
Question Stats:
60% (01:56) correct
40%
(02:01)
wrong
based on 763
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Ornithologist: the curvature of the claws of the modern 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) Modern 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.
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) Modern 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.
30 Apr 2020, 12:44
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Ornithologist: the curvature of the claws of the modern 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) Modern tree-dwelling birds are the direct descendants of Archeopteryx. Direct descendants are not talked about. If we negate this then the conclusion is not breaking. So out.
(B) Archeopteryx made use of the curvature of its claws. Yes. If Archeopteryx did not make use of claws then Ornithologist's claim looses credibility. Potential answer
(C) There have never been tree-dwelling birds without curved claws. Never is too strong. Not hitting the conclusion.
(D) Archeopteryx was in fact the earliest birdlike creature. It is just a para-phrasing. Can not be an assumption.
(E) The curvature of the claws is the only available evidence for the claim that Archeopteryx was tree-dwelling. Archeopteryx doesnt care about the only evidence. We are talking about the present evidence. Something else is out of scope.
So only possible is B.
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) Modern tree-dwelling birds are the direct descendants of Archeopteryx. Direct descendants are not talked about. If we negate this then the conclusion is not breaking. So out.
(B) Archeopteryx made use of the curvature of its claws. Yes. If Archeopteryx did not make use of claws then Ornithologist's claim looses credibility. Potential answer
(C) There have never been tree-dwelling birds without curved claws. Never is too strong. Not hitting the conclusion.
(D) Archeopteryx was in fact the earliest birdlike creature. It is just a para-phrasing. Can not be an assumption.
(E) The curvature of the claws is the only available evidence for the claim that Archeopteryx was tree-dwelling. Archeopteryx doesnt care about the only evidence. We are talking about the present evidence. Something else is out of scope.
So only possible is B.
TheStoryteller
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Joined: 25 Apr 2020
Last visit: 22 Feb 2025
Posts: 58
Given Kudos: 137
Location: India
Schools: Rice Jones '23 (M$)
GMAT 1: 790 Q50 V51
GRE 1: Q167 V163
GPA: 3
01 May 2020, 00:37
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(A) Modern tree-dwelling birds are the direct descendants of Archeopteryx.
-- out of scope.
(B) Archeopteryx made use of the curvature of its claws.
--Correct. This would explain the Ornithologists argument that if the Archeopteryx made use of its claws then it must have been a tree dweller.
(C) There have never been tree-dwelling birds without curved claws.
--Irrelevant.
(D) Archeopteryx was in fact the earliest birdlike creature.
---Directly copies from the premise, hence not an assumption.
(E) The curvature of the claws is the only available evidence for the claim that Archeopteryx was tree-dwelling.
--No such claim is implied.
-- out of scope.
(B) Archeopteryx made use of the curvature of its claws.
--Correct. This would explain the Ornithologists argument that if the Archeopteryx made use of its claws then it must have been a tree dweller.
(C) There have never been tree-dwelling birds without curved claws.
--Irrelevant.
(D) Archeopteryx was in fact the earliest birdlike creature.
---Directly copies from the premise, hence not an assumption.
(E) The curvature of the claws is the only available evidence for the claim that Archeopteryx was tree-dwelling.
--No such claim is implied.
