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
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
Small but Deadly1. 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
"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 Sample Questions to assess your GMAT Quant.
If you found my post useful KUDOS are much appreciated.
IMPROVE YOUR READING COMPREHENSION with the ECONOMIST READING COMPREHENSION CHALLENGE:
Here is the first set along with some strategies for approaching this work: http://gmatclub.com/forum/the-economist-reading-comprehension-challenge-151479.html