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Manager
Joined: 27 Jan 2013
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GMAT 1: 780 Q49 V51
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08 Aug 2013, 15:12
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Hi All,

Welcome to the 6th installment of the Economist Reading Comprehension Challenge! Many of my GMAT students complain about the difficulties they have with science passages so I picked out a science topic for this week's challenge. For reading comprehension tips and for more information about how to approach your GMAT reading take a look at the first RCC thread: http://gmatclub.com/forum/the-economist-reading-comprehension-challenge-151479.html

Happy Studies,

HG.

Here is a link to the article: http://www.economist.com/news/science-and-technology/21582243-biggest-extinction-history-was-probably-caused-space-rock-changed

1. Which of the following is most strongly supported about the extinctions mentioned in the first paragraph of the passage?

A. They had similar causes but different outcomes

B. They were similar in that they each wiped out over 80% of the animal species on earth

C. There were similar extinctions before the Cambrian period

D. It is unknown whether they had different causes

E. Their combined force permitted the rise of the reptiles

2. According to the passage which of the following is implied about mammals before the Cretaceous period?

A. Their flourishing was at least partially suppressed by competition with other species

B. Having gone under rapid evolution they faced fierce competition from more established organisms.

C. They evolved specialized social behavior which helped them rise out of obscurity in the post-Cambrian period.

D. They were better adapted than most other species to deal with changing atmospheric conditions.

E. Fewer species of them became extinct than species of reptiles

3. Which of the following statements is best supported about the weakened ecosystems mentioned in the 4th paragraph of the passage?

A. Some species benefited from a weakening of the world’s ecosystem

B. During periods of more frequent volcanic eruptions the ecosystem was more disrupted than during periods with fewer volcanic eruptions

C. Some of the volcanic eruptions were the effect and not the cause of some of the weakened ecosystems

D. They were the primary cause of the extinctions in the Cretaceous period.

E. The weakened ecosystems were the most important amongst several factors that caused an abrupt extinction at the end Permian period

4. According to the passage Dr. Tohver would most likely agree that each of the following were major contributors to the extinctions in the Cambrian period EXCEPT:

A. The mix of gasses in the atmosphere

B. uncharacteristic seismic activity

C. an increase in volcanic eruptions

D. Global warming

E. The geology of Araguainha

[Reveal] Spoiler:
1. D
2. A
3. A
4. C

_________________

"It is a curious property of research activity that after the problem has been solved the solution seems obvious. This is true not only for those who have not previously been acquainted with the problem, but also for those who have worked over it for years." -Dr. Edwin Land

GMAT vs GRE Comparison

If you found my post useful KUDOS are much appreciated.

Here is the first set along with some strategies for approaching this work: http://gmatclub.com/forum/the-economist-reading-comprehension-challenge-151479.html

Last edited by HerrGrau on 11 Aug 2013, 07:06, edited 1 time in total.
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Intern
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Joined: 12 Jun 2013
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11 Aug 2013, 00:40
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4. According to the passage Dr. Tohver would most likely agree that each of the following were major contributors to the extinctions in the Cambrian period EXCEPT:[/b]

A. The mix of gasses in the atmosphere

B. uncharacteristic seismic activity

C. an increase in volcanic eruptions

D. Global warming

E. The geology of Araguainha

I think the answer of this question must be C because Dr. tohver do accept that it was global warming that initiated the extinction, but he lend no support to volcanic eruption as the cause of extinction.

Guys could you plz.. help.......-- Thanks.
Manager
Joined: 27 Jan 2013
Posts: 230
GMAT 1: 780 Q49 V51
Followers: 48

Kudos [?]: 212 [0], given: 32

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11 Aug 2013, 07:09
Hi Sohrab,

Great job on this! You are 100% correct. I typed in the wrong answer. All of the others (Global Warming, The Gasses, The Seismic Activity, the Composition of the land) were mentioned. Dr. Tohver is actually saying that the eruptions were not a major factor. Really solid work picking this out. Let me know if you have any further questions.

Happy Studies,

HG.
_________________

"It is a curious property of research activity that after the problem has been solved the solution seems obvious. This is true not only for those who have not previously been acquainted with the problem, but also for those who have worked over it for years." -Dr. Edwin Land

GMAT vs GRE Comparison

If you found my post useful KUDOS are much appreciated.

Here is the first set along with some strategies for approaching this work: http://gmatclub.com/forum/the-economist-reading-comprehension-challenge-151479.html

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18 Apr 2015, 02:21
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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18 Apr 2015, 03:02
HerrGrau wrote:
Hi Sohrab,

Great job on this! You are 100% correct. I typed in the wrong answer. All of the others (Global Warming, The Gasses, The Seismic Activity, the Composition of the land) were mentioned. Dr. Tohver is actually saying that the eruptions were not a major factor. Really solid work picking this out. Let me know if you have any further questions.

Happy Studies,

HG.

Hi! HerrGrau,
4. According to the passage Dr. Tohver would most likely agree that each of the following were major contributors to the extinctions in the Cambrian period EXCEPT
According to the passage, Dr. Tohver redated the Araguainha crate to 257.4m years, while the Cambrian period is about 541m ago. So how can Dr. Tohver agree that the geology of Araguainha could be a contributors to the extinctions in the Cambiran period?
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21 May 2015, 00:38
Can someone help me with question 3? Where is it mentioned, that some species benefit from a weakened ecosystem?
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