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Manager
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Networks of blood vessels in bats' wings serve only to [#permalink]
 28 Mar 2006, 18:23
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Networks of blood vessels in bats' wings serve only to disperse heat generated in flight. This heat is generated only because bats flap their wings. Thus paleontologists' recent discovery that the winged dinosaur Sandactylus had similar networks of blood vessels in the skin of its wings provides evidence for the hypothesis that Sandactylus flew by flapping its wings, not just by gliding.
The argument in the passage relies on which of the following assumptions?
A. Sandactylus would not have had networks of blood vessels in the skin of its wings if these networks were of no use to Sandactylus.
B. All creatures that fly by flapping their wings have networks of blood vessels in the skin of their wings.
C. Winged dinosaurs that flapped their wings in flight would have been able to fly more effectively than winged dinosaurs that could only glide.
D. If Sandactylus flew by flapping its wings, then paleontologists would certainly be able to find some evidence that it did so.
E. Heat generated by Sandactylus in flapping its wings in flight could not have been dispersed by anything other than the blood vessels in its wings.
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VP
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It has to be between A and B.....Going with B.
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Manager
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I choose A. "all creatures" in B is very strong phase.
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Director
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I would go with A.
B says that All creatures that fly by flapping their wings have networks of blood vessels in the skin of their wings. But passage actually assumes the reverse ie. creatures having blood vessels in the skin fly by flapping the wings.
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Senior Manager
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E...
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Director
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^ A ^
It does not necessarily mean that networks of blood vessels of Sandactylus serve only to disperse heat just like it is in bats. Just looking at the similarity between two kinds is not enough to make such a conclusion.
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Senior Manager
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SunShine wrote: E...
I think E requires additional assumption that Sandactylus were also generation heat while flying.
B is 180 degree.
so the best answer is A.
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Senior Manager
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B ....
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Manager
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i would go with A .... this is a good one
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Manager
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OA is A.
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