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It is posited by some scientists that the near extinction of the sap-

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It is posited by some scientists that the near extinction of the sap-  [#permalink]

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New post 15 Feb 2016, 09:33
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It is posited by some scientists that the near extinction of the sap-eating gray bat of northwestern America was caused by government-sponsored logging operations in the early 1920s that greatly reduced the species’ habitat

Which of the following, if true, most strongly weakens the scientists’ claims?

(A) Logging operations in the 1920s are widely held responsible for the near extinction of other species that lived in the same area.

(B) A boom in new home construction in the early 1920s led congress to open federal lands to logging operations.

(C) A 5-year drought in the early 1920s severely reduced the output of sap in trees in northwestern America.

(D) Numbers of sightings of sap-eating gray bats fell to their lowest numbers in 1926.

(E) Sightings of sap-eating gray bats in Europe stayed roughly the same during the same period.

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It is posited by some scientists that the near extinction of the sap-  [#permalink]

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New post Updated on: 15 Feb 2016, 13:37
My guess is C

A it strengthens the claim
B it doesn't matter
C it can explain the near extinction of the sap-eating gray bat in NW America, weakening the assumption that it's fault of government-sponsored logging operations
D it's just another information, not useful to strengthen or weaken our case
E we're talking about the NW America specie and specifically about the impact of logging operations, so this information about Europe is not really helpful

Originally posted by n2223 on 15 Feb 2016, 10:41.
Last edited by n2223 on 15 Feb 2016, 13:37, edited 1 time in total.
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Re: It is posited by some scientists that the near extinction of the sap-  [#permalink]

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New post 15 Feb 2016, 12:42
C for me
the argument is that near extinction of sap-eating bats caused by logging operations in early 1920's
in order to weaken this argument, one has to introduce something new that shows that X didnt cause Y but it is Z that causes Y.
In this case C says that its 5-years drought that reduces the output of sap. thus, its the shortage of sap in trees that is the cause of near extinction of bats
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Re: It is posited by some scientists that the near extinction of the sap-  [#permalink]

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New post 21 Feb 2019, 23:27
Meaning: Scientists claim that:
Cause1: government-sponsored logging operations in the early 1920s
Effect1: great reduction in the sap-eating gray bats’ habitat

Cause2: great reduction in the sap-eating gray bats’ habitat
Effect2: near extinction of the sap-eating gray bat

Weaken the claim:
1) for the given cause no or different effect
2) a different cause for the given effect

Answer: C (a different cause for the given effect)
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Re: It is posited by some scientists that the near extinction of the sap-   [#permalink] 21 Feb 2019, 23:27
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It is posited by some scientists that the near extinction of the sap-

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