▶ Your Answer :
In the set of
materials, both the reading passage and the lecturer deal with the controversial
issues about the roles of Lambeosaurus’ crests. Regarding this topic, the
lecture argues that it is different from what we know about crests of
Lambeosaurus. This contradicts the writer’s assertion that Lambeosaurus had the
roles of unique physical trait7n.
First of all,
according to the lecturer, it is completely doubtful that crests used to obtain
mates. Reptiles which are similar with dinosaurs are likely to attract another
gender by behavior and sound, not appearance. For example, crocodiles use their
head in order to attract mates by doing behavior or noise. This counters the
writer’s claim that crests may have been used to fascinate opposing sex.
Moreover, the
lecturer goes on to say that it is impossible for crests of Lambeosaurus to use
for combat. Crests extended not forward, but backward. It means when
Lambeosaurus fought with other dinosaurs, they might not have been used crests.
According to fossil fuels, crests also had hollow inside. It is not suitable
for Lambeosaurus to fight enemies. This challenges the writer’s argument that the
crests were used for fighting.
Lastly, the
lecturer maintains that the crests might have been not provided Lambeosaurus
with sufficient oxygen. Lambeosaurus might have been needed tremendous oxygen,
because it has massive body. But, crests are too small to offer oxygen for Lambeosaurus’s
huge frame in a short time. The lecturer thinks that it will be better to take deeply
breath out of the water. This rebuts the writer’s viewpoint that crests used to
supply air while Lambeosaurus ate beneath water.
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