▶ Your Answer :
The reading passage contends that the
crests 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 the crest is used to attract mates. The Lambeosaurus is reptile
and the male reptile such as crocodile use behavior and sound to communicate
with female. For example, the crocodile lifts their head and make noise to
attract female. Experts suppose that the Lambeosaurus did it similarly. This
casts doubt on the reading passage’s claim that the male dinosaurs attract
females using the crests.
Second, according to the lecture, crests
were not used for combat. This is because crests extend to backward given that
the dinosaurs’ crest. If they used it to fight, it would grow to forward.
Moreover, Triceratops’ horns are dense and sold to fight, but those of Lambeosaurus’
are too hollow to use it for striking or defending. This refutes the reading
passage’s argument that the crest is a helmet or weapon.
The final point made by the lecture is that
the dinosaur did not use horns to supply air. Lambeosaurus was very massive and
needed a lot of oxygen. However, the crests are so small that it was not useful
to store air and provide it. Consequently, it seemed to be more logical, they
would deep breathe instead. This counters the reading passage’s assertion that
the crests was used to supply air to Lambeosaurus when they keep their heads
underwater.
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