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Full-length FE mock with insightful analytics, weakness diagnosis, and video explanations!
11 Oct 2017, 23:40
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Geologists recently discovered marks that closely resemble worm tracks in a piece of sandstone. These marks were made more than half a billion years earlier than the earliest known traces of multicellular animal life. Therefore, the marks are probably the traces of geological processes rather than of worms.
Which one of the following, if true, most weakens the argument?
(A) It is sometimes difficult to estimate the precise age of a piece of sandstone.
(B) Geological processes left a substantial variety of marks in sandstone more than half a billion years before the earliest known multicellular animal life existed.
(C) There were some early life forms other than worms that are known to have left marks that are hard to distinguish from those found in the piece of sandstone.
(D) At the place where the sandstone was found, the only geological processes that are likely to mark sandstone in ways that resemble worm tracks could not have occurred at the time the marks were made.
(E) Most scientists knowledgeable about early animal life believe that worms are likely to have been among the earliest forms of multicellular animal life on Earth, but evidence of their earliest existence is scarce because they are composed solely of soft tissue.
Source: LSAT
Which one of the following, if true, most weakens the argument?
(A) It is sometimes difficult to estimate the precise age of a piece of sandstone.
(B) Geological processes left a substantial variety of marks in sandstone more than half a billion years before the earliest known multicellular animal life existed.
(C) There were some early life forms other than worms that are known to have left marks that are hard to distinguish from those found in the piece of sandstone.
(D) At the place where the sandstone was found, the only geological processes that are likely to mark sandstone in ways that resemble worm tracks could not have occurred at the time the marks were made.
(E) Most scientists knowledgeable about early animal life believe that worms are likely to have been among the earliest forms of multicellular animal life on Earth, but evidence of their earliest existence is scarce because they are composed solely of soft tissue.
Source: LSAT
12 Oct 2017, 18:42
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Masshole
Geologists recently discovered marks that closely resemble worm tracks in a piece of sandstone. These marks were made more than half a billion years earlier than the earliest known traces of multicellular animal life. Therefore, the marks are probably the traces of geological processes rather than of worms.
Which one of the following, if true, most weakens the argument?
Which one of the following, if true, most weakens the argument?
(A) It is sometimes difficult to estimate the precise age of a piece of sandstone.
The difficuly to estimate the precise age of sandstone is irrelevant to the argument
(B) Geological processes left a substantial variety of marks in sandstone more than half a billion years before the earliest known multicellular animal life existed.
This choice somewhat strengthens the argument.
(C) There were some early life forms other than worms that are known to have left marks that are hard to distinguish from those found in the piece of sandstone.
This choice strengthens the argument since this choice indicates that if the marks are not the traces of geological processes, they are probably the traces of other life forms rather than of worms (the probability that the marks are the traces of worms is really low).
(D) At the place where the sandstone was found, the only geological processes that are likely to mark sandstone in ways that resemble worm tracks could not have occurred at the time the marks were made.
Correct. This choice lefts out the possibility that the marks are the trace of geological processes.
(E) Most scientists knowledgeable about early animal life believe that worms are likely to have been among the earliest forms of multicellular animal life on Earth, but evidence of their earliest existence is scarce because they are composed solely of soft tissue.
This choice is irrelevant to the argument.
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08 Apr 2019, 22:39
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Akela
Geologists recently discovered marks that closely resemble worm tracks in a piece of sandstone. These marks were made more than half a billion years earlier than the earliest known traces of multicellular animal life. Therefore, the marks are probably the traces of geological processes rather than of worms.
Which one of the following, if true, most weakens the argument?
(A) It is sometimes difficult to estimate the precise age of a piece of sandstone.
(B) Geological processes left a substantial variety of marks in sandstone more than half a billion years before the earliest known multicellular animal life existed.
(C) There were some early life forms other than worms that are known to have left marks that are hard to distinguish from those found in the piece of sandstone.
(D) At the place where the sandstone was found, the only geological processes that are likely to mark sandstone in ways that resemble worm tracks could not have occurred at the time the marks were made.
(E) Most scientists knowledgeable about early animal life believe that worms are likely to have been among the earliest forms of multicellular animal life on Earth, but evidence of their earliest existence is scarce because they are composed solely of soft tissue.
Source: LSAT
Which one of the following, if true, most weakens the argument?
(A) It is sometimes difficult to estimate the precise age of a piece of sandstone.
(B) Geological processes left a substantial variety of marks in sandstone more than half a billion years before the earliest known multicellular animal life existed.
(C) There were some early life forms other than worms that are known to have left marks that are hard to distinguish from those found in the piece of sandstone.
(D) At the place where the sandstone was found, the only geological processes that are likely to mark sandstone in ways that resemble worm tracks could not have occurred at the time the marks were made.
(E) Most scientists knowledgeable about early animal life believe that worms are likely to have been among the earliest forms of multicellular animal life on Earth, but evidence of their earliest existence is scarce because they are composed solely of soft tissue.
Source: LSAT
Conclusion:
Marks are traces of GP(geological processes) rather than of Worms.
Pre-thinking:
Assumption: Traces of Worms/MultiCellularAnimals CANNOT pre-date the marking time on the sandstone.
Answer choice analysis of D and E:
- (D) At the place where the sandstone was found, the only geological processes that are likely to mark sandstone in ways that resemble worm tracks could not have occurred at the time the marks were made.
- Meaning: The GP(geological processes) that could have marked the sandstone DID NOT occur at the time when marks were ACTUALLY made.
- Let's say:
- Marks were marked on the sandstone in 1500 BC.
The GP(geological processes) that could have marked did NOT occur in 1500 BC.
- The trap-answer: Evidence of their earliest existence is scarce.
The scarcity of the evidence CAN sway in BOTH directions. - Let's say further evidences are found.
Strengthen:
- Further evidence SHOWS that MultiCellularAnimals predate the marks.
- Further evidence DOES NOT SHOW that MultiCellularAnimals predate the marks.
- A CORRECT weakener should NOT affect the conclusion after many more assumptions.
Any answer choice which CAN sway in BOTH the directions is NEVER a correct answer.
