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

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

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New post 07 Jan 2014, 12:17
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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.IRRELEVANT
(B) The capacity of blackbirds to lay viable eggs increases with each successive trial during the first few years of reproduction.INSTEAD OF NESTING EXPERIENCE , THIS COULD BE THE REASON FOR BETTER BREEDING LATER...CORRECT
(C) The breeding success of birds nesting for the second time is greater than that of birds nesting for the first time.ITS ALREADY GIVEN IN STIMULUS .....IT IS JUST A PREMISE...
(D) Smaller and weaker blackbirds breed just as successfully as bigger and stronger blackbirds.THIS STRENGTHENS THE ARGUMENT..NOTE "This cannot be a mere matter of size and strength, since blackbirds, like t.........
(E) Up to 25 percent of all birds are killed by predators before they start to nestIRRELEVANT


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New post 17 Jun 2015, 09:09
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New post 01 Jul 2016, 01:03
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New post 09 Oct 2016, 00:35
11MBA wrote:
The answer should be B.

The statement concludes that blackbirds benefit from their nesting experience, because they breed more successfully with each trial. However, if the capacity of blackbirds to lay viable eggs increases with age then it's not the experience that's affecting success of breeding. Instead it's an inherant biological factor that has nothing to do with experience.

the stimulus at the very beginning is so misleading that it confuses me with the capacity to success breeding with the ability to build nest
I'm driven crazy by LSAT>,<
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Re: Learning how to build a nest plays an important part in the breeding s [#permalink]

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New post 13 Dec 2017, 04:59
gurpreet07 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

Source: LSAT


The key to (B) is understanding the term "capacity." In this context, it means ability - kind of like in a physiological context. In other words, (B) says that it is NOT the nesting experience that leads to more success in breeding but RATHER it is the adaptation of their bodies - every time they lay eggs, they get better!

-Year 2 of breeding was more successful than Year 1; Year 3 was more successful than Year 2
-This cannot be explained by size and strength
-It must be explained by their nesting experience

I simply want to show why it is NOT the nesting experience that led to this. Maybe the blackbirds get progressively healthier during their first years of nesting. Either way, I just want to show an alternative explanation as that is basically the best way to weaken this claim.

(A) "Other birds?" Who cares?

(B) Yea! If the ability to lay more viable eggs increases, then it is NOT the nesting experience but rather their physiology that explains the uptick in success: their eggs are more viable!

(C) We basically already knew this: premise booster.

(D) This actually strengthens by ruling out an alternative explanation. It says that strengthen and size don't matter! Thus, we couldn't just say, "well during the 2nd and 3rd years the birds were stronger or bigger!" to weaken this claim because (D) says, "not so fast! Those things don't matter!" Whenever we rule out an alternative explanation, we are strengthening the argument if just by a little.

(E) "All birds" is too wide of a scope and we don't care about happens before they start to nest - we care about what happens after!
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Re: Learning how to build a nest plays an important part in the breeding s   [#permalink] 13 Dec 2017, 04:59

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