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Networks of blood vessels in bats’ wings serve only to dispe

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Networks of blood vessels in bats’ wings serve only to dispe [#permalink] New post 08 Apr 2014, 17:00
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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 Sandactytus.

(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 wingsin 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 findsome 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.
[Reveal] Spoiler: OA

Last edited by carcass on 09 Apr 2014, 02:53, edited 1 time in total.
Edited the title of the question and formatted properly
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Re: CR question [#permalink] New post 08 Apr 2014, 19:25
Let us say these networks were of use to the dinosaur in such a way that these networks helped the dinosaur to to have flexible wings. Now that goes well with option A that says - 'andactylus would not have had networks of blood vessels in the skin of its wings if these networks were of no use to Sandactytus.'

But that doesn't necessarily prove the hypothesis that Sandactylus flew by flapping its wings, not just by gliding.

IMO E
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Re: CR question [#permalink] New post 08 Apr 2014, 21:36
The argument makes an analogy between bats' wings and those of Sandactylus. The basic assumption is that if the Sandactylus had networks of blood vessels,it was solely due to flapping of wings. The correct option will be A.

You can also apply the negation test to the option and check.
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Re: CR question [#permalink] New post 08 Apr 2014, 22:29
Between A & E

E- Supports that the Srus used to flap its wings any ways but had no mechanism to diesperse the heat but the blood vessels
A- Supports the conclusion that the Dino has blood vessels-->Hence it flapped its wings..As blood vessels did not serve any other purpose & neither were they redundant
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Re: Networks of blood vessels in bats’ wings serve only to dispe [#permalink] New post 26 Apr 2014, 23:01
Is A indeed the correct answer?
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Re: Networks of blood vessels in bats’ wings serve only to dispe [#permalink] New post 27 Apr 2014, 04:01
Looks like E to me. Is A the answer?

Please provide OE.
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Re: Networks of blood vessels in bats’ wings serve only to dispe [#permalink] New post 25 Jun 2014, 09:28
chshashankreddy wrote:
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 Sandactytus.

(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 wingsin 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 findsome 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.

I also went for E on this one.
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Re: Networks of blood vessels in bats’ wings serve only to dispe [#permalink] New post 03 Jul 2014, 15:26
I really believe only possible choice is B. I think this is a horrible question though.

A - Network of blood vessels used for different reasons (say to breath). So A is true, but does not support the stem.
C - Clearly wrong
D - Clearly wrong
E - Ok let's say that it's true, 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. And then? Does it tell us that Sandactylus flapped its wings? Definitely not.

B - Since all creatures that flap have blood vessel network hence Sandactylus (that has this network from the stem) must flap its wings (given that this caractheristic has remained the same over time and across animals).
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Re: Networks of blood vessels in bats’ wings serve only to dispe [#permalink] New post 05 Jul 2014, 02:46
Between A and E but negation clearly affect A. Answer is A
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Re: Networks of blood vessels in bats’ wings serve only to dispe [#permalink] New post 05 Jul 2014, 03:31
chshashankreddy wrote:
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 Sandactytus.
Negate: S could have had useless networks of blood vessels in the skin of its wings..The whole thing that vessels are here necessarily to fulfill a purpose...A it is
(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.

Negate: S had other ways to disperse heat generated by flapping..So what..It still had the blood vessels as one of the way to disperse the heat..Argument intact..E fails
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Re: Networks of blood vessels in bats’ wings serve only to dispe [#permalink] New post 05 Jul 2014, 03:58
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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 Sandactytus.
the network of blood vessels serve only to disperse heat generated in flight.
so it has a certain function and usage.
negation of this option will break the argument apart

(B) All creatures that fly by flapping their wings have networks of blood vessels in the skin of their wings. we can infer from the argument that those creatures that their wings have networks of blood vessels in the skin of their wings fly by flapping their wings not vice versa.

(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. they've already found some evidence.. network of blood vessels.

(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.

we have a premise:Networks of blood vessels in bats’ wings serve only to disperse heat generated in flight. ---> there might be other ways that bats disperse heat generated in flight. however, the usage of Networks of blood vessels in bats' wings is only to disperse heat generated in flight------- so, E is incorrect
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Re: Networks of blood vessels in bats’ wings serve only to dispe [#permalink] New post 07 Jul 2014, 01:30
bb61 wrote:
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 Sandactytus.
the network of blood vessels serve only to disperse heat generated in flight.
so it has a certain function and usage.
negation of this option will break the argument apart

(B) All creatures that fly by flapping their wings have networks of blood vessels in the skin of their wings. we can infer from the argument that those creatures that their wings have networks of blood vessels in the skin of their wings fly by flapping their wings not vice versa.

(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. they've already found some evidence.. network of blood vessels.

(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.

we have a premise:Networks of blood vessels in bats’ wings serve only to disperse heat generated in flight. ---> there might be other ways that bats disperse heat generated in flight. however, the usage of Networks of blood vessels in bats' wings is only to disperse heat generated in flight------- so, E is incorrect


But I can see the correct option as E of the same question in another link .. Can you please explain the mismatch ..
Re: Networks of blood vessels in bats’ wings serve only to dispe   [#permalink] 07 Jul 2014, 01:30
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