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# Learning how to build a nest plays an important part in the

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CEO
Joined: 29 Mar 2007
Posts: 2553

Kudos [?]: 536 [0], given: 0

Learning how to build a nest plays an important part in the [#permalink]

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18 Nov 2007, 19:10
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Learning how to build a nest plays an important part in the breeding success of birds. For example, Dr. Snow has recorded the success of a number of blackbirds in several successive years. He finds that birds nesting for the first time are less successful in breeding than are older birds, and also less successful than they themselves are a year later. This cannot be a mere matter of size and strength, since blackbirds, like the great majority of birds, are fully grown when they leave the nest. It is difficult to avoid the conclusion that they benefit by their nesting experience.
Which one of the following, if true, would most weaken the argument?

A. Blackbirds build better nests than other birds.

B. The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction.

C. The breeding success of birds nesting for the second time is greater than that of birds nesting for the first time.

D. Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds.

E. Up to 25 percent of all birds are killed by predators before they start to nest.

Kudos [?]: 536 [0], given: 0

Senior Manager
Joined: 28 Jun 2007
Posts: 315

Kudos [?]: 55 [0], given: 0

Re: CR- Blackbirds [#permalink]

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18 Nov 2007, 20:04
The answer is B.

The "capacity to lay viable eggs" is to blame rather than the ability to build a nest.

GMATBLACKBELT wrote:
B. The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction.

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Manager
Joined: 25 Jul 2007
Posts: 65

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18 Nov 2007, 21:15
straight B..because it is the correct one and also because the other options totally cancel out...

Kudos [?]: 9 [0], given: 0

Manager
Joined: 10 Dec 2006
Posts: 90

Kudos [?]: 30 [0], given: 0

Re: CR- Blackbirds [#permalink]

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18 Nov 2007, 21:17
gluon wrote:
The answer is B.

The "capacity to lay viable eggs" is to blame rather than the ability to build a nest.

GMATBLACKBELT wrote:
B. The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction.

Its B. The conclusion says that building nests is related to the breeding success. B weakens the conclusion by pointing out another reason behind the improved breeding capacity.

Kudos [?]: 30 [0], given: 0

CEO
Joined: 29 Mar 2007
Posts: 2553

Kudos [?]: 536 [0], given: 0

Re: CR- Blackbirds [#permalink]

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18 Nov 2007, 21:41
gluon wrote:
The answer is B.

The "capacity to lay viable eggs" is to blame rather than the ability to build a nest.

GMATBLACKBELT wrote:
B. The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction.

Thx. for some reason I just totally missed this.

Kudos [?]: 536 [0], given: 0

Re: CR- Blackbirds   [#permalink] 18 Nov 2007, 21:41
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# Learning how to build a nest plays an important part in the

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