▶ Your Answer :
In the given a set of materials, the reading and the lecture both deal with the roles of Lambeosaurus crest. The lecturer challenges the reading passage’s argument that axe-shaped crests on the top of Lambeosaurus’ head may have the particular roles. First of all, the author contends that the crests were used to attract opposite gender. In contrast, the lecturer refutes the argument by saying that most reptiles attract their mates by sound and behavior not appearance. In the case of crocodiles, they communicate with mates by lifting their heads and making noise. Thus, the claim the author insists is false. Second, the article insists that the crests were used for combat. The speaker, however, rebuts by asserting that the crests was unsuitable for fighting. According to fossils, the crests is located in backward instead of forward, so they were not useful in fights. Unlike the hard and dense horns of the Triceratops, the crests of the dinosaurs were fragile to attack because they were hollow. So, the argument the article maintain is erroneous. Finally, the writer claims that the crest were used to supply air. The professor counters the contention by stating that the crests did not provide sufficient air. The crest were very small compared to thesize of dinosaur’s massive body. As a result, dinosaur need a lot of oxygen, but small crests were not able to store sufficient oxygen to eat aquatic foods in underwater. Therefore, the notion the writer claims does not make sense. |