GMAT Exam Dumps | Paleontologist: Dinosaurs belonged to two major taxonomic groups, the Saurischia and the Orlnithischia.

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Question 135/255

Paleontologist: Dinosaurs belonged to two major taxonomic groups, the Saurischia and the Orlnithischia.
Scientists have long known that the branch of the Saurischia from which birds are descended had primitive feathers. However, a recently discovered fossil of a previously unknown Orinithischia species also has feather-like structures. Thus, dinosaurs must have evolved feathers early in their history, before the Saurischia and Orinithischia diverged.
Which of the following is an assumption the paleontologist's argument requires?

A. It is not likely that Orinithischia evolved feathers independently of Saurischia.

B. Most species of both the Orinithischia and the Saurischia had primitive feathers.

C. At least some bird species are descended from the previously unknown dinosaur species of the recently discovered fossil.

D. Scientists had not previously discovered any fossils from Orinithischia species that had primitive feathers.

E. At least one dinosaur fossil dating from the era before the Saurischia and Orinithischia diverged shows evidence of feather-Ike structures.

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