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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.
Which of the following, if true, most seriously weakens the argument in the passage?
(A) Sandactylus' wings were far more similar to the wings of bats than to the wings of birds.
(B) Paleontologists do not know whether winged dinosaurs other than Sandactylus had similar networks of blood vessels in the skin of their wings.
(C) The mechanism used by bats for dispersing heat in flight could, in principle, work for much larger flying creatures, such as Sandactylus.
(D) Not all the bats that use the mechanism described in the passage for dispersing heat in flight live in climates similar to the climate in which Sandactylus lived.
(E) Other winged dinosaurs that flew only by gliding had networks of blood vessels in the skin of their wings similar to those that Sandactylus had.
OA E
Source: Official Guide
Which of the following, if true, most seriously weakens the argument in the passage?
(A) Sandactylus' wings were far more similar to the wings of bats than to the wings of birds.
(B) Paleontologists do not know whether winged dinosaurs other than Sandactylus had similar networks of blood vessels in the skin of their wings.
(C) The mechanism used by bats for dispersing heat in flight could, in principle, work for much larger flying creatures, such as Sandactylus.
(D) Not all the bats that use the mechanism described in the passage for dispersing heat in flight live in climates similar to the climate in which Sandactylus lived.
(E) Other winged dinosaurs that flew only by gliding had networks of blood vessels in the skin of their wings similar to those that Sandactylus had.
OA E
Source: Official Guide
