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The reading passage indicates that Sinosauropteryx was not a feathered dinosaur because some paleontologists misinterpret lines as evidence of Sinosauropteryx's feathers. However, based on the listening, the evidence that the lines represent feathers is strong. The arguments in the reading are not convincing.
First, the reading claims that the lines may not represent functional structures of a living Sinosauropteryx. Instead, the lines are possibly fibers. However, the professor's lecture contradicts what the reading suggests. She argues in the lecture that it is unlikely the lines represent the decomposition of the dinosaur' s skin because we do not see any such decomposition in the fossils of animals buried at the same site. The fossils of animals buried at the same site indicate that the functional skin structures of this species have been well preserved. Therefore, the lines are one of functional skin structures, possibly feathers, not fibers caused by decomposition.
Second, the author of the reading holds the opinion that the lines are much more likely to be fossilized remains of frills than feathers. But the professor in the lecture refutes this point by saying that there is an important chemical difference between feathers and frills: feathers contain a protein called beta-keratin. On the other hand, frills do not have beta-keratin. Chemical analyses suggest that the lines contain beta-keratin. Thus, the lines are feathers as opposed to frills.
Third, from the reading, we know that the lines do not represent feathers because the location of the lines makes them useless for flight and thermoregulation. In contrast, the listening challenges this point by taking peacock as an example. Peacocks have long and colorful feathers. They display their feathers to attract mate. This function is called display function. Chemical analyses suggest that the lines in Sinosauropteryx's body are colorful. Therefore, these lines are feathers used for display.
