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Geologists recently discovered marks that closely resemble worm tracks

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Geologists recently discovered marks that closely resemble worm tracks [#permalink]

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Question Stats:

55% (01:31) correct 45% (01:18) wrong based on 69 sessions

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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
[Reveal] Spoiler: OA

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Re: Geologists recently discovered marks that closely resemble worm tracks [#permalink]

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New post 12 Oct 2017, 18:42
Masshole wrote:
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.
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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Re: Geologists recently discovered marks that closely resemble worm tracks   [#permalink] 12 Oct 2017, 18:42
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Geologists recently discovered marks that closely resemble worm tracks

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