▶ Your Answer :
The reading passage’s claim that the role
of an axe-shaped crest on the top of Lambenosaurus can be explained by three theories.
On the other hand, the lecturer brings up several points to contradict this
argument.
First, the speaker argues that dinosaurs
mostly use its behavior and sound to attract a mate. For example, crocodiles, which
are similar to Lambeosaurus, lift its head and make growling noises to attract
other gender. Lambeosaurus is expected to do a similar method. This counters the
reading passage’s assertion that the axe-shaped crest is used to attract
mates.
Second, according to the lecturer, the axe-shaped the crest is less likely to be used for combat. This is supported by the fact that if
we look at the fossils, its heads are extended backward. If the crests are used
for fighting, they would have to be extended to its front. Also, the crest of
Lambeosaurus is fragile and hollow inside. If it was suitable for combat, it
would have to be solid and dense, since they could get hurt easily. This refutes
the statement of the reading passage’s claim that crest is used for combat
between predators and Lambeosaurus.
The final point made by the speaker is that
Lambeosaurus is just too massive by its size for the crest to be used for storing
air while they held its head underwater to eat. The crest is too small for containing
enough air to be used while Lambeosaurus eat. The air would be gone in a short
time, and it would be much more logical if Lambeosaurus itself take a deep breaths
before diving into the water. This counters the reading passage’s argument that
the axe-shaped crest is used for supply air while they put their head underwater
to eat.
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