A popular beach has long had a dolphin feeding program in : GMAT Critical Reasoning (CR)
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# A popular beach has long had a dolphin feeding program in

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A popular beach has long had a dolphin feeding program in [#permalink]

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03 Jan 2011, 11:14
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A popular beach has long had a dolphin feeding program in which fish are given to dolphins several times a day; many dolphins get as much as half of their food each day there. Although dolphins that first benefit from the program as adults are healthy and long-lived, their offspring have a lower life expectancy than offspring of dolphins that feed exclusively in the wild. Which of the following, if true, most helps to explain the lower life expectancy of offspring of dolphins feeding at the beach compared to other young dolphins?
A. Sharks that prey on dolphins are less common in the open seas off the beach than in many other areas of the open seas where dolphins congregate.
B. Many of the adult dolphins that feed at the beach are females that nurse their offspring there.
C. The fish given to the dolphins at the beach are the same types of fish that dolphins typically catch in the wild.
D. Many dolphins that feed at the beach with their offspring come to the beach only a few times a month.
E. Adult dolphins that feed at the beach spend much less time teaching their offspring how to catch fish in the wild than do other adult dolphins.
[Reveal] Spoiler: OA

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Re: A popular beach has long had a dolphin feeding program in [#permalink]

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03 Jan 2011, 13:23
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A. Sharks that prey on dolphins are less common in the open seas off the beach than in many other areas of the open seas where dolphins congregate.
It actually gives another reason that live expectancy should be more.
B. Many of the adult dolphins that feed at the beach are females that nurse their offspring there.
Same as A.
C. The fish given to the dolphins at the beach are the same types of fish that dolphins typically catch in the wild.
Then life life expectancy should be same(provided amount of food is also same). Doesn't explain the difference though.
D. Many dolphins that feed at the beach with their offspring come to the beach only a few times a month.
Irrelevant as it also Doesn't explain the difference.
E. Adult dolphins that feed at the beach spend much less time teaching their offspring how to catch fish in the wild than do other adult dolphins.
This can be the reason why they are not healthy and have lower life expectancy.Because they are only dependent on the 1/2 of their diet on the food provided through the feeding program.So for another half they have to make effort.And if they don't know how to get the food the live expectancy will decline
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Re: A popular beach has long had a dolphin feeding program in [#permalink]

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20 Jan 2012, 21:01
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I believe A is also a contender but E is the best answer as E's explanation is a super set of that of A.
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Re: A popular beach has long had a dolphin feeding program in [#permalink]

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23 Jun 2014, 21:40
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noboru wrote:
A popular beach has long had a dolphin feeding program in which fish are given to dolphins several times a day; many dolphins get as much as half of their food each day there. Although dolphins that first benefit from the program as adults are healthy and long-lived, their offspring have a lower life expectancy than offspring of dolphins that feed exclusively in the wild. Which of the following, if true, most helps to explain the lower life expectancy of offspring of dolphins feeding at the beach compared to other young dolphins?
A. Sharks that prey on dolphins are less common in the open seas off the beach than in many other areas of the open seas where dolphins congregate.
B. Many of the adult dolphins that feed at the beach are females that nurse their offspring there.
C. The fish given to the dolphins at the beach are the same types of fish that dolphins typically catch in the wild.
D. Many dolphins that feed at the beach with their offspring come to the beach only a few times a month.
E. Adult dolphins that feed at the beach spend much less time teaching their offspring how to catch fish in the wild than do other adult dolphins.

Responding to a pm:

Fish are given to dolphins several times a day; many dolphins get as much as half of their food each day there.
Dolphins that first benefit from the program as adults are healthy and long-lived, but their offspring have a lower life expectancy than offspring of dolphins that feed exclusively in the wild.

This is a kind of 'explain the paradox' question. You expect the offspring of all dophins to have similar life expectancy. You might even think that dolphins who feed at the beach and their offspring might, in fact, have better life expectancy than others since half of their daily need is supplied by the beach. But actually offspring of dolphins that feed at the beach have lower life expectancy!

What will explain this?

D. Many dolphins that feed at the beach with their offspring come to the beach only a few times a month.

This doesn't explain why the life expectancy of the offspring of these dolphins should be lower. Perhaps, if they come to the beach only a few times a month, the beach has no importance for them. But then, why should their offspring have lower life expectancy? The others make do with the fish from the wild - they can do so too.

E. Adult dolphins that feed at the beach spend much less time teaching their offspring how to catch fish in the wild than do other adult dolphins.

This explains the paradox perfectly. Adult dolphins that are busy at the beach don't teach fishing to their offspring. This means that the offspring don't learn how to make up the other half of their daily diet. The fish at the beach provide only half of their diet. They don't learn how to catch fish in the wild and make up the day's quota. On the other hand, the dolphins sticking to the wild spend time teaching fishing to their offspring and hence the life expectancy of their offspring is higher.

Answer (E)
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Re: A popular beach has long had a dolphin feeding program in [#permalink]

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03 Jan 2011, 13:17
My first thought when having read the text was:
Is the lower life expectancy based on their offspring not being able to feed themselves or due to shark attacks?

A) Opposite explanation, they would have longer life expectancy not shorter
B) Irrelevant
C) No point
D) Irrelevant
E) Solid and clear explanation to the life the lower life expectancy.

Answer: E
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04 Jan 2011, 15:44
OA is E.
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06 Jan 2011, 03:35
Thanks for the explanation vjsharma25
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Re: A popular beach has long had a dolphin feeding program in [#permalink]

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26 Nov 2011, 00:38
+1 E
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26 Nov 2011, 01:40
The answer is E
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07 Dec 2011, 03:04
+1 E, the offspring cannot survive in the wild when it lacks of training from its busy parent.
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07 Dec 2011, 08:46
+1 for E
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07 Dec 2011, 22:21
IMO E
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08 Dec 2011, 00:55
+1 for E
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22 Jan 2012, 20:37
Got confused with A, but now I understand it must be E
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23 Jan 2012, 08:16
i too would go with E
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Re: A popular beach has long had a dolphin feeding program in [#permalink]

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23 Jan 2012, 13:42
I Got E as well. What is everyone's time? Mine was 2:30. I knew the answer was E around 1:30 but spent the extra time looking over the possible answer choices again and looking at the Question stem to make sure one last time that E was right.

What are your guys thoughts? should I be spending less time or is this common when people are taking the GMAT?
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25 Jan 2012, 16:56
It is clearly E .
Te reson is that the offsprings of the dolphins in the beach are less competent to catch the fish in the wild compared to those in the wild .Hence a lower availability of food and lower life expectancy .
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25 Jan 2012, 23:19
+1 E anyone ?
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01 May 2014, 19:21
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Re: A popular beach has long had a dolphin feeding program in [#permalink]

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23 Jun 2014, 21:10
D. Many dolphins that feed at the beach with their offspring come to the beach only a few times a month.
E. Adult dolphins that feed at the beach spend much less time teaching their offspring how to catch fish in the wild than do other adult dolphins.

My query is between (D) and (E).

How can one relate time teaching offspring to 'lower expectancy among offspring'?

(D) says dolphins come to beach only a few times a month, and hence consume less food ?

I know I am going wrong somewhere.

Plz highlight how option (E) is best
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Re: A popular beach has long had a dolphin feeding program in   [#permalink] 23 Jun 2014, 21:10

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