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3) What would cause reduced sunlight? Only an orbital change. Think back on what the author says about the orbital change theory: its only evidence is the glaciation itself. This new evidence would therefore weaken the author‘s argument about the orbital theory: (D).

(A): Out of Scope. Though volcanic eruptions can lead to a reduction in the amount of sunlight that reaches earth, it isn't necessarily the case here.

(B): Out of Scope. As above. This evidence is outside the scope of the volcanic theory.

(C): Opposite. The author never makes this claim.

(D): The correct answer

(E):It does have relevance to the passage as described above
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Can anybody explain how Option C - It supports the claim that ice ages were accompanied by widespread loss of vegetation.
of Question 3 is opposite.
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Can anybody explain how Option C - It supports the claim that ice ages were accompanied by widespread loss of vegetation.
of Question 3 is opposite.

I would have said C for question 3 too


Sent from my iPhone using GMAT Club Forum mobile app
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malbash01
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Can anybody explain how Option C - It supports the claim that ice ages were accompanied by widespread loss of vegetation.
of Question 3 is opposite.

I would have said C for question 3 too


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malbash01
NonPlus

hey guys hope you are ejoying your gmat weekend :)

Question: Suppose paleobotanists discover that during geological periods of reduced sunlight, ancient forests died away, leaving fossilized remains. What is the relevance of this information to the passage?

Now C is wrong because there is no claim that ice ages were accompanied by widespread loss of vegetation.

I guess you guys chose C based on the extract below, which is wrong.

“It‘s also possible that volcanic eruptions had tossed enough dust into the atmosphere to screen out sunlight and cool the earth”

However the key information to correct answer is in the extract below:

For example, a change in the earth‘s orbit could have reduced the amount of sunlight reaching the planet. However, the only physical signature of such an event that would show in the rocks would be the marks of the glaciers themselves.


The first sentence in red is a claim without evidence, and the second sentence in blue emphasizes that only event based on physical signature i.e. evidence in this case -marks in the rocks- is the only prove of a change in orbit

Hence D would weaken claim that the only evidence of a change in orbit is glacier marks, if paleobotanists had discovered that during geological periods of reduced sunlight, ancient forests died away, leaving fossilized remains.

cheers
D :)
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sandysilva



3) What would cause reduced sunlight? Only an orbital change. Think back on what the author says about the orbital change theory: its only evidence is the glaciation itself. This new evidence would therefore weaken the author‘s argument about the orbital theory: (D).

(A): Out of Scope. Though volcanic eruptions can lead to a reduction in the amount of sunlight that reaches earth, it isn't necessarily the case here.

(B): Out of Scope. As above. This evidence is outside the scope of the volcanic theory.

(C): Opposite. The author never makes this claim.

(D): The correct answer

(E):It does have relevance to the passage as described above


HII Sandysliva
can you please take me to the line mentioning "its ONLY evidence is the glaciation itself."...
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Can someone provide passage mapping for this RC?
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Can someone provide passage mapping for this RC?

Passage Summary

Topic and Scope - The lack of definite evidence for the early ice ages and one scientist‘s preferred theory of their cause.

Mapping the Passage

Para 1 describes Agassiz‘s reasons and evidence for theorizing an ice age.

Para 2 demonstrates that evidence for the early ice ages is thin, making it difficult to reconstruct dates and causes.

Para 3 describes Frakes‘ favourite theory: continental drift promoted glaciation.

Para 4 and 5 demonstrate further that evidence for the early ice ages is thin.

Para 6 suggests that relatively little data lets scientists run wild in their theorizing.

Strategy Points:

Watch out for double negatives! Paraphrase them to make sense, writing in the margins if necessary. In this passage, misinterpreting “least unlikely” could hurt a test-taker rushing through without paraphrasing.
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Question 2, 'a theory that has some supporting evidence is better than a theory that cannot be proved' such savage
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