One of the more reliable methods of determining regional : GMAT Critical Reasoning (CR)
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# One of the more reliable methods of determining regional

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Director
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23 Jul 2007, 10:30
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One of the more reliable methods of determining regional climatic conditions in prehistoric periods is to examine plant pollen trapped in glacial ice during ancient times. By comparing such pollen samples with spores taken from modern vegetation, scientists can figure out approximately what the weather was like at the time of pollen deposition. Furthermore, by submitting the prehistoric samples to radiocarbon dating techniques, we can also determine when certain climatic conditions were prevalent in that portion of the globe.
Which one of the following may be inferred from the information in the passage?
(A) The earth has undergone several glacial periods.
(B) Radiocarbon dating can be corroborated by glacial evidence.
(C) Similarities between prehistoric and contemporary climates do not exist.
(D) Pollen deposition is a fairly continuous process.
(E) Certain flora are reliably associated with particular climatic conditions.
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Director
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24 Jul 2007, 11:24
E it is.
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24 Jul 2007, 13:58
D, E is temping but we're talking about pollen

*edit* I think
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24 Jul 2007, 15:17
I would choose D.

(A) The earth has undergone several glacial periods. - passage does not say anything about glacial periods.
(B) Radiocarbon dating can be corroborated by glacial evidence. - we are not trying to verify radiocarbon tech.
(C) Similarities between prehistoric and contemporary climates do not exist. - actually it can be inferred that the similarities exists.
(D) Pollen deposition is a fairly continuous process. - true, to get samples form different times to compare, it has to be a continuous process.
(E) Certain flora are reliably associated with particular climatic conditions. - method here is to compare pollen sample, not the vegetation.
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24 Jul 2007, 17:00
I'm going to go with A here. I was stuck between A and D but with D you have to find something in the argument to prove that it's a continuous process. and then what's continuous - is it everyday, everyhour or once every 1000yrs. The others can't be right.
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24 Jul 2007, 17:09
I'd go with E. The type of flora present would determine the climatic conditions. The pollen is an identifier of the flora.
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25 Jul 2007, 15:09
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25 Jul 2007, 15:16
By comparing such pollen samples with spores taken from modern vegetation, scientists can figure out approximately what the weather was like at the time of pollen deposition.

Which one of the following may be inferred from the information in the passage?
(A) The earth has undergone several glacial periods.
(B) Radiocarbon dating can be corroborated by glacial evidence.
(C) Similarities between prehistoric and contemporary climates do not exist.
(D) Pollen deposition is a fairly continuous process.
(E) Certain flora are reliably associated with particular climatic conditions.

I still say E. The fact that pollen deposition is a continuous process tells us nothing about the climate. The type of flora is dependent on the climate. The passage says that the pollen spores are compared with modern vegetation - i.e. to determine what type of plant they came from.

What is the OA?
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25 Jul 2007, 15:26
D

edit: duh, I already did this one. they are all looking the same!
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25 Jul 2007, 15:29
[quote="zakk"]D

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25 Jul 2007, 15:32
Robin in NC wrote:
zakk wrote:
D

Dunno. Not my problem But I think so!
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25 Jul 2007, 21:38
One more vote for D.

A, D, E were the ones I chose from.
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25 Jul 2007, 22:32
One of the more reliable methods of determining regional climatic conditions in prehistoric periods is to examine plant pollen trapped in glacial ice during ancient times. By comparing such pollen samples with spores taken from modern vegetation, scientists can figure out approximately what the weather was like at the time of pollen deposition. Furthermore, by submitting the prehistoric samples to radiocarbon dating techniques, we can also determine when certain climatic conditions were prevalent in that portion of the globe.
Which one of the following may be inferred from the information in the passage?
(A) The earth has undergone several glacial periods.
(B) Radiocarbon dating can be corroborated by glacial evidence.
(C) Similarities between prehistoric and contemporary climates do not exist.
(D) Pollen deposition is a fairly continuous process.
(E) Certain flora are reliably associated with particular climatic conditions.

E seems to be the choice.
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25 Jul 2007, 22:55
I think it is E

In choice D where does it say in the argument that the process is continuous
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25 Jul 2007, 22:55
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