GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 22 Jun 2018, 05:58

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

A favored theory to explain the extinction

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Senior CR Moderator
User avatar
V
Status: Long way to go!
Joined: 10 Oct 2016
Posts: 1390
Location: Viet Nam
GMAT ToolKit User Premium Member
A favored theory to explain the extinction [#permalink]

Show Tags

New post 05 Oct 2017, 01:41
6
00:00
A
B
C
D
E

Difficulty:

  75% (hard)

Question Stats:

59% (02:20) correct 41% (02:15) wrong based on 261 sessions

HideShow timer Statistics

A favored theory to explain the extinction of dinosaurs, together with many other species, has been the globally catastrophic collision of a large asteroid with the Earth. Supporting evidence is an extraterrestrial chemical element in a layer of dust found worldwide at a geological level laid down contemporaneously with the supported event. A new competing theory contends that any asteroid impact was irrelevant, because it was massive volcanic activity that caused the extinctions by putting enough dust into the atmosphere to cool the planet. The Deccan region of India contains extensive volcanic flows that occurred within the same time period as the supposed asteroid impact and the extinctions.

Which one of the following, if true, most strongly indicates that the asteroid-impact theory is at least incomplete, if not false?

(A) Large concentrations of dinosaur nests with fossil eggs found in Alberta indicate that at least some species of dinosaurs congregated in large groups during some part of their lives.

(B) Dinosaur remains indicate that some species of dinosaur could have migrated in herds over wide ranges, so that they could have traveled to escape the local effects of certain catastrophes.

(C) Legends from many cultures, such as the Greek legend that Cadmus raised an army by sowing dragons’ teeth in the ground, show that various ancient peoples worldwide were familiar with the fossils of dinosaurs.

(D) In the Gobi desert in China, where now only small animals can eke out an existence, fossil dinosaur skeletons 27 feet long were found in circumstances indicating that the climate there was as dry when the dinosaurs lived as it is now.

(E) The fossil record in Montana from below the layer of extraterrestrial dust shows a diminution over time in dinosaur species from 35 to 13, and dinosaur teeth found above the dust layer show a diminution in species from 13 to 5.

Source: LSAT

Same passage with different stem question: LINK

_________________

Actual LSAT CR bank by Broall

How to solve quadratic equations - Factor quadratic equations
Factor table with sign: The useful tool to solve polynomial inequalities
Applying AM-GM inequality into finding extreme/absolute value

New Error Log with Timer

Director
Director
avatar
P
Joined: 14 Nov 2014
Posts: 667
Location: India
Schools: Rotman '20 (S)
GMAT 1: 700 Q50 V34
GPA: 3.76
Re: A favored theory to explain the extinction [#permalink]

Show Tags

New post 05 Oct 2017, 02:07
By POE , I will go with E ..As the fossil record is found both top and below the extraterrestrial dust, it strengthens the point that there may be some other catastrophic event that led animal extinction ..

Posted from my mobile device

Posted from my mobile device
Manager
Manager
avatar
B
Joined: 05 Dec 2014
Posts: 211
Location: India
GMAT 1: 690 Q48 V36
GPA: 3.54
Re: A favored theory to explain the extinction [#permalink]

Show Tags

New post 18 Nov 2017, 07:52
broall wrote:
A favored theory to explain the extinction of dinosaurs, together with many other species, has been the globally catastrophic collision of a large asteroid with the Earth. Supporting evidence is an extraterrestrial chemical element in a layer of dust found worldwide at a geological level laid down contemporaneously with the supported event. A new competing theory contends that any asteroid impact was irrelevant, because it was massive volcanic activity that caused the extinctions by putting enough dust into the atmosphere to cool the planet. The Deccan region of India contains extensive volcanic flows that occurred within the same time period as the supposed asteroid impact and the extinctions.

Which one of the following, if true, most strongly indicates that the asteroid-impact theory is at least incomplete, if not false?

(A) Large concentrations of dinosaur nests with fossil eggs found in Alberta indicate that at least some species of dinosaurs congregated in large groups during some part of their lives.

(B) Dinosaur remains indicate that some species of dinosaur could have migrated in herds over wide ranges, so that they could have traveled to escape the local effects of certain catastrophes.

(C) Legends from many cultures, such as the Greek legend that Cadmus raised an army by sowing dragons’ teeth in the ground, show that various ancient peoples worldwide were familiar with the fossils of dinosaurs.

(D) In the Gobi desert in China, where now only small animals can eke out an existence, fossil dinosaur skeletons 27 feet long were found in circumstances indicating that the climate there was as dry when the dinosaurs lived as it is now.

(E) The fossil record in Montana from below the layer of extraterrestrial dust shows a diminution over time in dinosaur species from 35 to 13, and dinosaur teeth found above the dust layer show a diminution in species from 13 to 5.

Source: LSAT

Same passage with different stem question: LINK


Hi Broall,
Can u kindly explain option E. I felt Option D somehow suggests volcanic activity is not the reason. As the region is almost as dry now as it was earlier, and so there is no cooling effect and thus we cant ignore the asteroid theory.
1 KUDOS received
Senior Manager
Senior Manager
User avatar
G
Joined: 09 Mar 2017
Posts: 427
Location: India
Concentration: Marketing, Organizational Behavior
WE: Information Technology (Computer Software)
CAT Tests
A favored theory to explain the extinction [#permalink]

Show Tags

New post 18 Nov 2017, 08:37
1
Clearly E.
Only E provides support to both the theories without refuting one. D refutes the second theory(dust has resulted in cooling of the planet) stating that the temperature hasn't changed.
E provides evidence that both the theories have impacted in extinction because the fossil both above and below the extraterrestrial dust layer shows diminution.
_________________

------------------------------
"Trust the timing of your life"
Hit Kudus if this has helped you get closer to your goal, and also to assist others save time. Tq :)

Verbal Forum Moderator
User avatar
V
Status: Greatness begins beyond your comfort zone
Joined: 08 Dec 2013
Posts: 2016
Location: India
Concentration: General Management, Strategy
Schools: Kelley '20, ISB '19
GPA: 3.2
WE: Information Technology (Consulting)
GMAT ToolKit User Reviews Badge CAT Tests
Re: A favored theory to explain the extinction [#permalink]

Show Tags

New post 15 Dec 2017, 23:43
broall wrote:
A favored theory to explain the extinction of dinosaurs, together with many other species, has been the globally catastrophic collision of a large asteroid with the Earth. Supporting evidence is an extraterrestrial chemical element in a layer of dust found worldwide at a geological level laid down contemporaneously with the supported event. A new competing theory contends that any asteroid impact was irrelevant, because it was massive volcanic activity that caused the extinctions by putting enough dust into the atmosphere to cool the planet. The Deccan region of India contains extensive volcanic flows that occurred within the same time period as the supposed asteroid impact and the extinctions.

Which one of the following, if true, most strongly indicates that the asteroid-impact theory is at least incomplete, if not false?

(A) Large concentrations of dinosaur nests with fossil eggs found in Alberta indicate that at least some species of dinosaurs congregated in large groups during some part of their lives.

(B) Dinosaur remains indicate that some species of dinosaur could have migrated in herds over wide ranges, so that they could have traveled to escape the local effects of certain catastrophes.

(C) Legends from many cultures, such as the Greek legend that Cadmus raised an army by sowing dragons’ teeth in the ground, show that various ancient peoples worldwide were familiar with the fossils of dinosaurs.

(D) In the Gobi desert in China, where now only small animals can eke out an existence, fossil dinosaur skeletons 27 feet long were found in circumstances indicating that the climate there was as dry when the dinosaurs lived as it is now.

(E) The fossil record in Montana from below the layer of extraterrestrial dust shows a diminution over time in dinosaur species from 35 to 13, and dinosaur teeth found above the dust layer show a diminution in species from 13 to 5.

Source: LSAT

Same passage with different stem question: LINK


We're looking for the answer choice that most strongly suggests that the theory that the asteroid impact caused the dinosaurs' extinction is no good. How does (E) fit the bill?

Well, what (E) suggests is that dinosaur species were dying off precipitously before the asteroid hit (because layers of dust beneath the asteroid dust would have to have been formed earlier than the asteroid dust), and continued to do so afterward. The most important part here is that the lion's share of species extinctions occurred, according to (E), before the asteroid impact! If that's the case, the asteroid couldn't have been the main cause of the extinctions.

Does that make sense? Remember, the theory we're seeking to undermine is not the theory that there was an asteroid impact. Whether there was an impact is not in question. The issue is, did the impact cause the dinosaurs to go extinct?

As for the other answers:

(A) is way out of scope. How does this affect the asteroid theory?

(B) is tempting, but we're told that the asteroid impact was "globally catastrophic." So we don't care whether dinosaurs could escape some local catastrophes.

(C) is going, going, gone! Way out of scope!

(D), yeah, it's out of scope. Who cares about climates in the Gobi desert?
_________________

When everything seems to be going against you, remember that the airplane takes off against the wind, not with it. - Henry Ford
The Moment You Think About Giving Up, Think Of The Reason Why You Held On So Long
+1 Kudos if you find this post helpful

Manager
Manager
avatar
B
Joined: 05 Dec 2014
Posts: 211
Location: India
GMAT 1: 690 Q48 V36
GPA: 3.54
Re: A favored theory to explain the extinction [#permalink]

Show Tags

New post 16 Dec 2017, 00:19
TaN1213 wrote:
Clearly E.
Only E provides support to both the theories without refuting one. D refutes the second theory(dust has resulted in cooling of the planet) stating that the temperature hasn't changed.
E provides evidence that both the theories have impacted in extinction because the fossil both above and below the extraterrestrial dust layer shows diminution.


Hi Tan123,
Can u kindly explain that how E supports both the theories?
Manager
Manager
User avatar
S
Joined: 23 May 2017
Posts: 226
Concentration: Finance, Accounting
WE: Programming (Energy and Utilities)
CAT Tests
Re: A favored theory to explain the extinction [#permalink]

Show Tags

New post 05 Jan 2018, 12:32
sunny91 wrote:
TaN1213 wrote:
Clearly E.
Only E provides support to both the theories without refuting one. D refutes the second theory(dust has resulted in cooling of the planet) stating that the temperature hasn't changed.
E provides evidence that both the theories have impacted in extinction because the fossil both above and below the extraterrestrial dust layer shows diminution.


Hi Tan123,
Can u kindly explain that how E supports both the theories?


Supporting evidence is an extraterrestrial chemical element in a layer of dust found worldwide at a geological level laid down contemporaneously with the supported event.

A new competing theory contends that any asteroid impact was irrelevant, because it was massive volcanic activity that caused the extinctions by putting enough dust into the atmosphere to cool the planet.


what is E saying

(E) The fossil record in Montana from below the layer of extraterrestrial dust shows a diminution over time in dinosaur species from 35 to 13,
and dinosaur teeth found above the dust layer show a diminution in species from 13 to 5.

By this statement - we can infer there were two layers of two different composition of dust.

first layer - -- layer of dust formed by the volcanic activity

second layer - layer of dust formed by extraterrestrial chemical element

hence it is supporting both the theories of extinction.
_________________

If you like the post, please award me Kudos!! It motivates me

Re: A favored theory to explain the extinction   [#permalink] 05 Jan 2018, 12:32
Display posts from previous: Sort by

A favored theory to explain the extinction

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.