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Learning how to build a nest ...

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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. Thus, 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.

Official Answer

1 Answer

flamingo
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A we are talking about blackbirds and we are not comparing them with other birds this option has no impact on the argument 
C this option not truely weakens the argument as its written that 
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. 
C only talks about first two years 
D tries to contradict the premise but it doesnt contradict the conclusion that nesting plays a role 
E is irrelevant 
B is best as it states the nesting isn't the main reason its their hit and trial of reproducing 

answered Jun 3, 2015 by Guru (5,628 points)
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