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

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Learning how to build a nest plays an important part in the [#permalink]  06 Nov 2004, 17:19
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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.
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B is my choice.

Quote:
(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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I'd say D
B doesn't attack the conclusion that size has something to do with bird nesting. D does exactly that.
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Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds. is true; the statement "... 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...." is wrong.

I go with d
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Re: CR-Birds Nesting [#permalink]  07 Nov 2004, 03:25
doggita wrote:
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.

The answer should be "B" only.

Conclusion:
Birds benefit by their nesting experience.

Evidence:
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.

Choice "B" says
" capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction "
So it says - it is not nesting experience but something else which increses breeding success.

eagar to know OA and Explanation.
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"D" can not be the correct answer bcoz it actually bolster one of the evidence - "Increased breeding success 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 "

hope this will help,
Dharmin
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Dharmin, I think that we are heading for some serious trouble here. I re-read this and I think A should be the answer

The main argument that the author is trying to prove: "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."

D does NOT weaken the argument. It actually strengthens it by saying that YES, size and strength is not an issue. It supports the argument. And so does B as it concurs with the last sentence by saying that nesting experience is what makes the blackbird better after each and every trial. A on the hand, if true, would undermine the argument since if blackbirds are inherently better than other birds, then how can we confirm with any certainty whether it is the learning curve or the size and strength that do matter?

This is a very good question.
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Paul

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Agree with B.

Establishes that they breed and breed better by experience. Meaning nesting and breeding may not be inter related.
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I would go with B.
B says that it is due to their improvement in "skills" to lay eggs that they are more successful after each attempt and NOT because of better "nesting". Hence it breaks the main argument that it is due to "nesting" that they are more successful.

choice A says that blackbirds build better nests than other birds. but the imp. question is-- WHEN do they build better nests?? IT may be after gaining the same experience that blackbirds build better nests..we are talking about "nesting experience " here. So we have to PROVE that it is because of something else and NOT "nesting experience " that birds get better.

Can we have the OA please??
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GMAT Club Legend
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This question really baffled me. My own shortsightedness makes mee feel like I'm starting at square one again I totally misunderstood what the author was trying to prove. Thank you all for you inputs. Clearly B
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And the OA is B!!!

Thank you all!
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I got B without overanalysis.
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Does this help ???

My analysis -->
Scope Shift

At First, it is the "nesting for first time" that is mentioned
Next sentence, the focus is shifted to "size and strength"
Conclusion mentions relation to "nesting experience"

Hence the solution that would be recommended would be the one related to Nesting and not related to size and strength

Sheerluck Jones
-----------------------------------------------------------------------

Quote:
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.
[/quote]
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