▶ Your Answer :
The
reading passage contends that the roles of crest of Lambeosaurus’ head can be
fully explained by three theories. On the other hand, the lecturer brings up
several points that contradict this argument.
First, the speaker argues that it is doubtful
that Lambeosaurus used their crest to obtain mates. This is because they
utilized behavior and sound rather than their appearance. For example, crocodiles
lift their head and make noises as way to attract the opposite gender. Also, it
was similar to Lambeosaurus. This refutes the reading passage’s argument that the
crests were used to find mates.
Second, according to the lecturer, it is
unlikely that Lambeosaurus made use of its crests to protect itself. This is
supported by the fact that fossil evidence shows that the crests pointed
backward not forward. However, if the dinosaurs used the crests for combat,
they would have pointed forward. Moreover, they were hollow inside, which
means that they were too fragile to be used as weapons
to defend or strike. This casts doubt on the reading passage’s assertion
that the dinosaurs took advantage of the crests for combat.
The final
point made by the lecture is that it is unproven that the crests provide air while Lambeosaurus ate plants under the water. The
reasons is that since the dinosaurs were very big, so it required a lot of air.
On the other hand, the crests were small compared to the size of the dinosaurs.
It seems more logical that they would have taken a deep breath to store air. This
counters that the reading passage’s claims that the crests made the dinosaurs to
keep heads underwater for a long time. |