• Free Practice Test & Review
How would you score if you took the GMAT

Available with Beat the GMAT members only code

• Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

• Free Trial & Practice Exam
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• Award-winning private GMAT tutoring
Register now and save up to \$200

Available with Beat the GMAT members only code

• Free Veritas GMAT Class
Experience Lesson 1 Live Free

Available with Beat the GMAT members only code

• Get 300+ Practice Questions
25 Video lessons and 6 Webinars for FREE

Available with Beat the GMAT members only code

• 1 Hour Free
BEAT THE GMAT EXCLUSIVE

Available with Beat the GMAT members only code

• 5 Day FREE Trial
Study Smarter, Not Harder

Available with Beat the GMAT members only code

• 5-Day Free Trial
5-day free, full-access trial TTP Quant

Available with Beat the GMAT members only code

## alligator population

tagged by:

This topic has 2 expert replies and 9 member replies
maihuna Legendary Member
Joined
28 Dec 2008
Posted:
1578 messages
Followed by:
9 members
Thanked:
82 times
GMAT Score:
720

#### alligator population

Mon Dec 21, 2009 10:58 am
Elapsed Time: 00:00
• Lap #[LAPCOUNT] ([LAPTIME])
Parland’s alligator population has been declining in recent years, primarily because of hunting. Alligators prey heavily on a species of freshwater fish that is highly valued as food by Parlanders, who had hoped that the decline in the alligator population would lead to an increase in the numbers of these fish available for human consumption. Yet the population of this fish species has also declined, even though the annual number caught for human consumption has not increased.

Which of the following, if true, most helps to explain the decline in the population of the fish species?
A. The decline in the alligator population has meant that fishers can work in some parts of lakes and rivers that were formerly too dangerous.
B. Over the last few years, Parland’s commercial fishing enterprises have increased the number of fishing boats they use.
C. Many Parlanders who hunt alligators do so because of the high market price of alligator skins, not because of the threat alligators pose to the fish population.
D. During Parland’s dry season, holes dug by alligators remain filled with water long enough to provide a safe place for the eggs of this fish species to hatch.
E. In several neighboring countries through which Parland’s rivers also flow, alligators are at risk of extinction as a result of extensive hunting.

_________________
Charged up again to beat the beast

Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
scoobydooby Legendary Member
Joined
27 Aug 2008
Posted:
1035 messages
Followed by:
1 members
Thanked:
104 times
Mon Dec 21, 2009 11:19 am
would go with D, as it gives a reason why there might be a positive correlation between the decline in the number of alligators and the fish

A, B, C and E are out of scope.

SYim Junior | Next Rank: 30 Posts
Joined
07 Oct 2008
Posted:
29 messages
Mon Dec 21, 2009 1:05 pm
IMO D

kabirmohammed Junior | Next Rank: 30 Posts
Joined
23 Nov 2009
Posted:
15 messages
Thanked:
1 times
Mon Dec 21, 2009 3:47 pm
IMO C

gmatmachoman Legendary Member
Joined
28 Jul 2008
Posted:
2326 messages
Followed by:
2 members
Thanked:
173 times
Target GMAT Score:
740
GMAT Score:
710
Mon Dec 21, 2009 9:41 pm
scoobydooby wrote:
would go with D, as it gives a reason why there might be a positive correlation between the decline in the number of alligators and the fish

A, B, C and E are out of scope.
IMO B

D quotes only for the "dry season" but the argument talks about few years....

Isn't B fix the issue?

### GMAT/MBA Expert

Testluv GMAT Instructor
Joined
19 Oct 2009
Posted:
1302 messages
Followed by:
162 members
Thanked:
538 times
GMAT Score:
800
Tue Dec 22, 2009 1:20 am
Because it uses the word "explain", we can tell from the question stem (which we should always read first) that this is a paradox question (@gmatmachoman: in paradox question, the stimulus does not present an argument; instead the stimulus presents 2 or more facts out of whose combination arises a paradox).

In paradox questions, we look for a contrast keyword such as "yet", "but", "however" etc. Such a word will center the paradox; oftentimes by putting the fact that comes before "yet" together with the fact that comes after "yet" we will grip the paradox.

Another term for "paradox" is just "surprise".

If we look at the stimulus, we see the first word of the last sentence is "yet". Therefore, we can comprehend the paradox by contrasting the fact that comes before "yet" against the fact that comes after "yet". The paradox is: the alligators eat the fish and yet when the Parlanders kill the alligators there are fewer (not more) fish! This is indeed surprising.

Now, we go to the answer choices searching for one that will resolve the paradox, relieve our surprise.

Choice D resolves the paradox: it tells us that, by killing off the alligators, the Parlanders are actually decreasing the likelihood that the fish eggs will hatch. (The alligators dig holes that allow the fisheggs to thrive; ironically, the alligators help to sustain the fish population, even though they themselves eat the fish).

_________________
Kaplan Teacher in Toronto

Thanked by: Venkitaraman
Free GMAT Practice Test under Proctored Conditions! - Find a practice test near you or live and online in Kaplan's Classroom Anywhere environment. Register today!
Focus_gmat Junior | Next Rank: 30 Posts
Joined
17 Dec 2009
Posted:
17 messages
Target GMAT Score:
700+
GMAT Score:
600
Tue Dec 22, 2009 5:02 am
Testluv,

Could you please help me understand why A is incorrect.

### GMAT/MBA Expert

Testluv GMAT Instructor
Joined
19 Oct 2009
Posted:
1302 messages
Followed by:
162 members
Thanked:
538 times
GMAT Score:
800
Tue Dec 22, 2009 5:42 am
Focus_gmat wrote:
Testluv,

Could you please help me understand why A is incorrect.
Sure.

Well, the paradox is: why the heck is the fish population declining when the Parlanders are killing off alligators which eat the fish? Shouldn't the fish population then be increasing? This is the paradox, the surprise. We have to find an answer choice that explains this paradox. When looking at each answer choice in a paradox question, you have to ask yourself: Does this take care of it? Does this choice make me no longer wonder? Does it relieve my surprise, does it resolve the paradox?

Choice A doesn't come close to resolving this paradox; instead, it points out that, from killing off some of the alligators, the fishers have enjoyed a benefit--namely, they can work in places where it was previously too dangerous to work. How does this help in explaining why the fish population is declining?....It doesn't help at all-- in fact, the choice A doesn't even talk about fish. Thus, we are still wondering about the paradox.

_________________
Kaplan Teacher in Toronto

Free GMAT Practice Test under Proctored Conditions! - Find a practice test near you or live and online in Kaplan's Classroom Anywhere environment. Register today!
gmatmachoman Legendary Member
Joined
28 Jul 2008
Posted:
2326 messages
Followed by:
2 members
Thanked:
173 times
Target GMAT Score:
740
GMAT Score:
710
Mon Jan 18, 2010 1:40 am
@ Testluv:
Choice D resolves the paradox: it tells us that, by killing off the alligators, the Parlanders are actually decreasing the likelihood that the fish eggs will hatch. (The alligators dig holes that allow the fisheggs to thrive; ironically, the alligators help to sustain the fish population, even though they themselves eat the fish)

But what abt B??

B. Over the last few years, Parlandâ€™s commercial fishing enterprises have increased the number of fishing boats they use.

Reasoning: SInce number of fishing boats have increased it could have increased the number of fish being caught ,thereby reducing its count..

Is that not right??

Yeah I agree that D tries to link up the stated facts in the argument whereas B altogether brings in a new version to resolve the "surprise".

Plz do post your line of reasoning. I agree its easy to find a reason for a right answer rather finding a wrong reason for a
wrong one...(Deepak..that was ur fav Quote")

Joined
01 Jan 2009
Posted:
2567 messages
Followed by:
550 members
Thanked:
711 times
GMAT Score:
770
Mon Jan 18, 2010 7:48 am

@gamtmachoman: The fact that they have increased the number of boats might have an impact on the fish population, but we are straightforwardly told that this is not the case. Check out this excerpt from the stimulus:

Yet the population of this fish species has also declined, even though the annual number caught for human consumption has not increased.

The bolded part should help highlight why your reasoning is incorrect.

gmatmachoman Legendary Member
Joined
28 Jul 2008
Posted:
2326 messages
Followed by:
2 members
Thanked:
173 times
Target GMAT Score:
740
GMAT Score:
710
Tue Jan 19, 2010 12:19 am
DanaJ wrote:

@gamtmachoman: The fact that they have increased the number of boats might have an impact on the fish population, but we are straightforwardly told that this is not the case. Check out this excerpt from the stimulus:

Yet the population of this fish species has also declined, even though the annual number caught for human consumption has not increased.

The bolded part should help highlight why your reasoning is incorrect.
Seems convincing....Agreed!!

joseph32 Master | Next Rank: 500 Posts
Joined
22 Aug 2015
Posted:
303 messages
Sun May 15, 2016 10:51 pm
I believe the answer should be B

### Best Conversation Starters

1 Vincen 180 topics
2 lheiannie07 61 topics
3 Roland2rule 54 topics
4 ardz24 44 topics
5 VJesus12 14 topics
See More Top Beat The GMAT Members...

### Most Active Experts

1 Brent@GMATPrepNow

GMAT Prep Now Teacher

155 posts
2 Rich.C@EMPOWERgma...

EMPOWERgmat

105 posts
3 GMATGuruNY

The Princeton Review Teacher

101 posts
4 Jay@ManhattanReview

Manhattan Review

82 posts
5 Matt@VeritasPrep

Veritas Prep

80 posts
See More Top Beat The GMAT Experts