▶ Your Answer : In the reading passage, there is ample support for the author's claim that there was possible use of Lambeosaurus's crest. However, the professor in the lecture gives several reasons as a rebuttal to the author's points. ^ First, the professor contends that the crest of dinosaur was not used to draw potential mates. This is because most of reptiles took advantages of other things such as their behaviors or sounds, not their appearance. For example, crocodiles lift their head and make some noise when they lure opposit sexes. Therefore, the professor mentions that Lambeosaurus would have used similar ways. This casts doubt on the author's claim that the crest of Lambeosaurus was existed for attracting mates. ^ Next, the professor argues that the crest of Lambeosaurus was not for combat. Since the crest was extended backward, so it might not be used for fighting. In addition, the inside of the crest of dinosaur was hollow, not dense of hard. It was too fragile and weak to be a weapon for fighting. This counters the reading passage's assertion that the crest of Lambeosaurus was used to combat. ^ Finally, the professor insists that the crest was not used to support air while it is underwater. To explain, the size of Lambeosaurus was massive, so it might have needed a huge amount of oxygen when they spend time eating aquatic plants. However, the crest was too small to supply sufficient amount of air. It could have offered small air for few seconds. Taking deep breath would have been better than using air from their crest. This refutes the reading passage's suggestion that the crest of Lambeosaurus was used to provide air underwater.
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