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09 Mar 2020, 02:27
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
84% (01:34) correct
16%
(02:08)
wrong
based on 425
sessions
History
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Time
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Not Attempted Yet
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 the 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 intermediate between them.
(E) The earliest bird flew in an awkward manner.
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09 Mar 2020, 19:18
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Conclusion: "This, therefore, must have been the earliest bird—certainly the earliest found to the date."
Now, we are given that an impression of a feather in a limestone slab dating to the Mesozoic era was discovered. Considering this statement, for the conclusion to follow, it is necessary to establish the fact that in the Mesozoic era, no creatures other than birds had feathers of the kind of which the impression was discovered.
Hence, we need to "assume" option C.
Now, we are given that an impression of a feather in a limestone slab dating to the Mesozoic era was discovered. Considering this statement, for the conclusion to follow, it is necessary to establish the fact that in the Mesozoic era, no creatures other than birds had feathers of the kind of which the impression was discovered.
Hence, we need to "assume" option C.
09 Jul 2020, 14:48
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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 the date.
My Advice: Understand with Visual and fun.
Premise 1: During an excavation, workers dugged a hole and found a slab with a feather ( hmm... can be a feather or bird? Let C)
Premise 2: Before this excavation, people assumed that birds were found after the end of ME or when PTS disappeared during ME.
Premise 3: ( Look at this important contrasting word "BUT": Means there is a change): Now, they have found a bird feather on the slab which is belong to ME.
Conclusion: ( "Therefore Marker"): Means this is the earliest bird found till today.
Now find the gap: Assumption
1) There are no other species with feather other than birds during ME.
The argument assumes which one of the following? Hmm... Assumption question
(A) The creature to which the feather belonged was a descendant of the pterosaurs. Cannot be the answer because we want to find the answer before PTS.
(B) Birds with such feathers were preceded by species of birds with less-developed feathers. We do not want to know birds feathers development.
(C) In the Mesozoic era, no creatures other than birds had such feathers. Yes, the right answer. Take the negation, In the Mesozoic era, many creatures other than birds had such feathers. If many creature have feather, then this feather do not belong to bird. Hence, conclusion is destroyed.
(D) The feather belonged to a Mesozoic creature that was neither a pterosaur nor a bird, but intermediate between them. Irrelevant, because we are interested only in bird species not in other creatures.
(E) The earliest bird flew in an awkward manner. Hahaha...Ugliest choice....
My Advice: Understand with Visual and fun.
Premise 1: During an excavation, workers dugged a hole and found a slab with a feather ( hmm... can be a feather or bird? Let C)
Premise 2: Before this excavation, people assumed that birds were found after the end of ME or when PTS disappeared during ME.
Premise 3: ( Look at this important contrasting word "BUT": Means there is a change): Now, they have found a bird feather on the slab which is belong to ME.
Conclusion: ( "Therefore Marker"): Means this is the earliest bird found till today.
Now find the gap: Assumption
1) There are no other species with feather other than birds during ME.
The argument assumes which one of the following? Hmm... Assumption question
(A) The creature to which the feather belonged was a descendant of the pterosaurs. Cannot be the answer because we want to find the answer before PTS.
(B) Birds with such feathers were preceded by species of birds with less-developed feathers. We do not want to know birds feathers development.
(C) In the Mesozoic era, no creatures other than birds had such feathers. Yes, the right answer. Take the negation, In the Mesozoic era, many creatures other than birds had such feathers. If many creature have feather, then this feather do not belong to bird. Hence, conclusion is destroyed.
(D) The feather belonged to a Mesozoic creature that was neither a pterosaur nor a bird, but intermediate between them. Irrelevant, because we are interested only in bird species not in other creatures.
(E) The earliest bird flew in an awkward manner. Hahaha...Ugliest choice....
