By dating fossils of pollen and beetles, which returned : GMAT Critical Reasoning (CR)
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# By dating fossils of pollen and beetles, which returned

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Manager
Joined: 14 Dec 2004
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By dating fossils of pollen and beetles, which returned [#permalink]

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11 Apr 2005, 09:51
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12. By dating fossils of pollen and beetles, which returned after an Ice Age glacier left an area, it is possible to establish an approximate date when a warmer climate developed. In one glacial area, it appears from the insect record that a warm climate developed immediately after the melting of the glacier. From the pollen record, however, it appears that the warm climate did not develop until long after the glacier disappeared.

Each one of the following, if true, helps to explain the apparent discrepancy EXCEPT:

(A) Cold-weather beetle fossils can be mistaken for those of beetles that live in warm climates.
(B) Warm-weather plants cannot establish themselves as quickly as can beetles in a new environment.
(C) Beetles can survive in a relatively barren postglacial area by scavenging.
(D) Since planes spread unevenly in a new climate, researchers can mistake gaps in the pollen record as evidence of no new overall growth.
(E) Beetles are among the oldest insect species and are much older then many warm-weather plants.

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Director
Joined: 03 Nov 2004
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11 Apr 2005, 10:04
I will go with 'E'
(A) Cold-weather beetle fossils can be mistaken for those of beetles that live in warm climates.
This says that one of the premise can be wrong, so it can explain the discrepancy.

(B) Warm-weather plants cannot establish themselves as quickly as can beetles in a new environment.
This says that plants take a little longer to establish themselves and hence the discrepancy.

(C) Beetles can survive in a relatively barren postglacial area by scavenging.
This is the other part of 'B'

(D) Since planes spread unevenly in a new climate, researchers can mistake gaps in the pollen record as evidence of no new overall growth.
This is same as 'A' - one of the premise is wrong.

(E) Beetles are among the oldest insect species and are much older then many warm-weather plants.
This is it - this does not explain why the beetles & pollen record indicate different time periods.
Director
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11 Apr 2005, 10:11
E seems to be totally out of scope. A, B, C and D seems to address the issues stated in the stem.
VP
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11 Apr 2005, 10:26
"E" shud be it.....age of beetles compared with age of old plants has no bearing on finding the root of the discrepency.
Manager
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11 Apr 2005, 12:02
my choice is E but I am uncomfortable with this. can someone else jump in on this.
Manager
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12 Apr 2005, 12:21
Yes, OA is E.
12 Apr 2005, 12:21
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