▶ Your Answer :
In the reading passage, there is ample support for the author's claim that there are plausible theories that the purpose of Lambeosaurus' crests. However, the professor in the lecture gives several reasons as a rebuttal to the author's point.
First, the lecturer contends that it is so doubtful that Lambeosaurus used the crests to attract mates. Most of the reptiles use their behavior and sounds not appearance to attract females. For example, crocodiles lift their head and make noises to communicate with members of opposite sex. In this reason, Lambeosaurus would have used the same ways. This casts doubt on the reading passage's claim that large crests help the dinosaurs attract their mates.
Next, the lecturer asserts that it is less likely that crests were used as weapons. The fossils of the dinosaurs showed that the crests had been expanded toward backward. Also, the crests were hollow and fragile so it would not have been useful as weapons. This challenges the reading passage's assertion that the crests would have been useful tools to combat other dinosaurs.
Finally, the lecturer contends that the crest could not have been used to supply air. Lambeosaurus were so massive dinosaurs that such small crests must not have been used as the source of air. Rather it might have been more effective ways to take a deep breath for the dinosaurs before they ate the aquatic plants. This refutes the reading passage's claim that the crests help Lambeosaurus to gain air during their heads being underwater.
Good (24–30)
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