▶ Your Answer :
The
reading passage contends that the roles of the axe-shaped crest on the top of a
Lambeosaurus’s head. On the other hand, the lecturer brings up several points
that contradict this argument.
First,
the lecturer claims that the contend that the dinosaurs have attracted mates using
the crest is doubtful. This is because they attracted their mates by behaviors
and sounds. For example, crocodiles communicate with their mates by making some
noise. So, the dinosaurs would have used the similar method to attract females.
This counters the reading passage’s claim that the crests were used for
attracting the mates.
Next,
the lecturer argues that they didn’t use the crests for combats. From the
fossil records, the crests are extended backwards which is not suitable for fighting.
Also, unlike the hones that used for fighting by Triceratops, crests are hollow
inside which make them fragile. This casts doubt to the reading passage’s claim
that the physical features may have been used to combat.
Final,
the lecturer points out that the features didn’t provide air. As they are
massive dinosaurs, they need a lot of oxygen to breath. However, because the
features were pretty small, so they could not contain enough air for them. The
lecturer says that instead of using the crests, they could have just take a
deep breath. This refutes the reading passage’s claim that the hollow
characteristic of the crests made them possible to supply air while the dinosaurs
were underwater to eat.
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