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

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Manager
Joined: 10 Sep 2005
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Learning how to build a nest plays an important part in the [#permalink]  25 Oct 2005, 13:22
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Difficulty:

5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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.
Manager
Joined: 04 Oct 2005
Posts: 247
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Kudos [?]: 6 [0], given: 0

and E) ?
Manager
Joined: 10 Sep 2005
Posts: 164
Followers: 1

Kudos [?]: 5 [0], given: 0

18. 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.
Manager
Joined: 04 Oct 2005
Posts: 247
Followers: 1

Kudos [?]: 6 [0], given: 0

Hehe was not among the right choice anyways...
I go for B

A) not relevant as other birds are not compared to bb
B) keep, alternative explanation for the success of older bb rather then nest building experience
C) strengthens the argument
D) irrelevant
E) irrelevant
SVP
Joined: 16 Oct 2003
Posts: 1818
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B.
Director
Joined: 09 Jul 2005
Posts: 595
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The argument is that the only cause for the success in breeding birds is the improvement in building nest.

If we introduce another cause to explain the success the argument will be weakened. This is done by B. Therefore B should be the correct answer.
Director
Joined: 14 Sep 2005
Posts: 998
Location: South Korea
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I pick B.

It's not about how they develop nesting skills year by year, but about how they lay more viable eggs year by year.
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Auge um Auge, Zahn um Zahn !

Director
Joined: 15 Aug 2005
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Location: Singapore
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My pick is B!

The passage says the main cause for successful nesting is experience. SO we need to find an alternative cause. B provides that, as B says the success depends on the bird's capacity to lay successful eggs.
_________________

Cheers, Rahul.

Manager
Joined: 10 Sep 2005
Posts: 164
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Kudos [?]: 5 [0], given: 0

thanks....OA is B
Director
Joined: 29 Aug 2005
Posts: 503
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Kudos [?]: 6 [0], given: 0

I vote for 'B'
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