It is currently 26 Jun 2017, 09:23

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# In the late 1980 s, the population of sea otters in the

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

### Hide Tags

SVP
Joined: 16 Jul 2009
Posts: 1512
Schools: CBS
WE 1: 4 years (Consulting)
In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

24 Jul 2010, 16:58
2
KUDOS
3
This post was
BOOKMARKED
00:00

Difficulty:

15% (low)

Question Stats:

79% (02:05) correct 21% (01:15) wrong based on 716 sessions

### HideShow timer Statistics

In the late 1980’s, the population of sea otters in the North Pacific Ocean began to decline. Of the two plausible explanations for the decline—increased predation by killer whales or disease—disease is the more likely. After all, a concurrent sharp decline in the populations of seals and sea lions was almost certainly caused by a pollution related disease, which could have spread to sea otters, whereas the population of killer whales did not change noticeably

Which of the following, if true, most seriously weakens the reasoning?

A. Killer whales in the North Pacific usually prey on seals and sea lions but will, when this food source is scarce, seek out other prey.
B. There is no indication that substantial numbers of sea otters migrated to other locations from the North Pacific in the 1980’s.
C. Along the Pacific coast of North America in the 1980’s, sea otters were absent from many locations where they had been relatively common in former times.
D. Following the decline in the population of the sea otters, there was an increase in the population of sea urchins, which are sea otters’ main food source.
E. The North Pacific populations of seals and sea lions cover a wider geographic area than does the population of sea otters
[Reveal] Spoiler: OA

_________________

The sky is the limit
800 is the limit

GMAT Club Premium Membership - big benefits and savings

Intern
Status: Application submitted
Joined: 12 Jun 2010
Posts: 38
Location: NYC
Schools: Stern
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

25 Jul 2010, 09:08
1
KUDOS
B - states that reason for decline of sea otters is not the migration to other location. But this doesn't weaken or streanthen the reason.

C - states that in 1980's population of sea otters decliend but no reason is stated for it.

D - states the affect of decline of sea otters. But this doesn't weaken or streanthen the reason.

E - Again just tells about population spread but nothing else which will weaken or streanthen the reason.

But A points out that possible reason for declie eof sea otters if whales started to kill them. So think A is the orrect choice.
VP
Joined: 17 Feb 2010
Posts: 1491
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

26 Jul 2010, 12:03
1
KUDOS
A for me as it points out that pollution was possibly not the reason for the decline in sea otters population. Thus weakening the reasoning.
Manager
Joined: 04 Sep 2010
Posts: 51
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

14 Oct 2010, 23:50
1
KUDOS
A seems the best..
VP
Joined: 15 Jul 2004
Posts: 1445
Schools: Wharton (R2 - submitted); HBS (R2 - submitted); IIMA (admitted for 1 year PGPX)
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

25 Jul 2010, 08:56
I was between A and C --- but realized later that C talks about 1980's as a whole whereas the population decline concerns late 80's. What put me off about A was the fact that just because killer whales seek "other" prey does not necessarily strengthen the conclusion that the whales killed the otters...but well oh well...A is the best of the available lot.
Manager
Joined: 18 Oct 2008
Posts: 191
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

25 Jul 2010, 11:33
Conclusion - disease more likely the cause for population decline of sea otters
Premise- seals and sea lions population has come down but whale population is not affected.

Choice A clearly states that killer whales could be the cause of decline as they turn out to sea otters when there is a decline in seals and sea lions population.

Other choices IMO strengthens the arg.
Manager
Joined: 12 Jun 2007
Posts: 125
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

26 Jul 2010, 13:02
simple one. I go with A
Senior Manager
Status: Fighting on
Joined: 14 Mar 2010
Posts: 316
Schools: UCLA (R1 interview-WL), UNC(R2--interview-ding) Oxford(R2-Admit), Kelley (R2- Admit \$\$), McCombs(R2)
WE 1: SE - 1
WE 2: Engineer - 3
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

26 Jul 2010, 19:50
Only A gives an alternate explanation.
Senior Manager
Joined: 08 Jun 2010
Posts: 392
Location: United States
Concentration: General Management, Finance
GMAT 1: 680 Q50 V32
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

26 Jul 2010, 21:17
A weakens the argument by saying decrease is due to killer whales not pollution.
Manager
Joined: 09 Jul 2010
Posts: 142
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

27 Jul 2010, 03:09
the author is citing Disease as a most possible reason for the decline in popullation of sea otters. This is a simple causal flaw argument and an alternale cause can break the argument. There4 A it is.
_________________

consider cudos if you like my post

Manager
Joined: 11 Feb 2008
Posts: 90
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

27 Jul 2010, 03:40
A
gives a reason for decline is due to whales and not due to disease
_________________

-------------------------------------------------------------------------------------------
Amar
http://amarnaik.wordpress.com

Manager
Joined: 08 Jan 2010
Posts: 183
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

27 Jul 2010, 12:25
A...........

but couldn't use my brain faced a similar question in Knewton ..... only word changes..... free test .got it wrong and remember the answer..........so just got it
Manager
Joined: 24 Dec 2009
Posts: 219
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

27 Jul 2010, 14:00
-- Conclusion is - diseases have caused sharp decline in sea otters. To weaken the argument, we need to find a reason other than the disease for sharp decline.

A. Killer whales in the North Pacific usually prey on seals and sea lions but will,
when this food source is scarce, seek out other prey.
-- Since killer whales had started preying on sea animals other than seals and sea lions, sea otters were the possible next option to them. Hence sea otters started declining in 1980's because killer whales started preying them. Hence A is correct answer choice.

B. There is no indication that substantial numbers of sea otters migrated to other
locations from the North Pacific in the 1980’s.
--Since there is no indication that sea otters migrated to location other than North Pacific, the possible cause of decline in not clear from this answer choice. Hence B cannot be a correct answer choice.

C. Along the Pacific coast of North America in the 1980’s, sea otters were absent
from many locations where they had been relatively common in former times.
-- Irrelevant. Hence cannot be a correct answer choice.

D. Following the decline in the population of the sea otters, there was an increase
in the population of sea urchins, which are sea otters’ main food source.
--This answer choice mentions decline in sea otters, however fails to mention the possible cause for it. Hence it cannot weaken the argument and cannot be a correct answer choice.

E. The North Pacific populations of seals and sea lions cover a wider geographic
area than does the population of sea otters
-- Irrelevant. Hence E cannot be a correct answer choice.
Thank You.

Thanks,
Akhil M.Parekh
Manager
Joined: 01 Jul 2010
Posts: 51
Schools: LBS, Harvard, Booth, Stanford, ISB, NTU
WE 1: S/W Engineer
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

05 Aug 2010, 19:53
Easy A!
Director
Status: Impossible is not a fact. It's an opinion. It's a dare. Impossible is nothing.
Affiliations: University of Chicago Booth School of Business
Joined: 26 Nov 2009
Posts: 960
Location: Singapore
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

06 Aug 2010, 05:28
Thumbs up !
tryingharder wrote:
the author is citing Disease as a most possible reason for the decline in popullation of sea otters. This is a simple causal flaw argument and an alternale cause can break the argument. There4 A it is.

_________________

Please press kudos if you like my post.

Senior Manager
Joined: 14 Jun 2010
Posts: 310
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

16 Aug 2010, 05:26
A
GRE Forum Moderator
Affiliations: PMP certified, IT professional
Joined: 21 Jun 2010
Posts: 216
Location: USA
Schools: CMU, Kelley
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

16 Aug 2010, 09:42
Manager
Joined: 29 Dec 2009
Posts: 115
Location: india
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

18 Aug 2010, 01:01
A
Manager
Joined: 28 Feb 2010
Posts: 169
WE 1: 3 (Mining Operations)
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

18 Aug 2010, 02:18
I am in for A +1
_________________

Regards,
Invincible...
"The way to succeed is to double your error rate."
"Most people who succeed in the face of seemingly impossible conditions are people who simply don't know how to quit."

Senior Manager
Affiliations: Volunteer Operation Smile India, Creative Head of College IEEE branch (2009-10), Chief Editor College Magazine (2009), Finance Head College Magazine (2008)
Joined: 26 Jul 2010
Posts: 464
Location: India
WE2: Entrepreneur (E-commerce - The Laptop Skin Vault)
Concentration: Marketing, Entrepreneurship
GMAT 1: 710 Q49 V38
WE: Marketing (Other)
Re: In the late 1980 s, the population of sea otters in the [#permalink]

### Show Tags

07 Sep 2010, 03:16
After reading A you don't even have to look ahead...but good to see a different type of question.
_________________

Kidchaos

http://www.laptopskinvault.com

Follow The Laptop Skin Vault on:

Consider Kudos if you think the Post is good
Unless someone like you cares a whole awful lot. Nothing is going to change. It's not. - Dr. Seuss

Re: In the late 1980 s, the population of sea otters in the   [#permalink] 07 Sep 2010, 03:16

Go to page    1   2    Next  [ 31 posts ]

Similar topics Replies Last post
Similar
Topics:
67 Between 1980 and 2000 the sea otter population of the Aleutian Islands 39 11 Jun 2017, 04:46
In the years 1971 to 1980, the population of the state prison system 4 28 Apr 2017, 05:19
24 Investigation of the floor of the Black Sea, a saltwater sea connected 10 03 Jan 2016, 12:56
12 In 1980, 13% of the Arbican population moved from urban area 6 04 Sep 2016, 05:35
11 From 1970 to 1990, sea otters made up a steadily ... 6 22 May 2015, 06:12
Display posts from previous: Sort by

# In the late 1980 s, the population of sea otters in the

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

 Powered by phpBB © phpBB Group and phpBB SEO 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®.