▶ Your Answer :
The reading passage contends that an
axe-shaped crest on Lambeosaurus’s head might have had several roles. On the
other hand, lecturer brings up several points which contradict this argument.
First of all, the speaker argues that it is
doubtful to say the crest was used to attract their potential mates. For
instance, crocodiles, who are similar to Lambeosaurus, utilized their behavior
and sound. They lifted their heads and made low sounds to lure potential mates.
This cast doubt on the reading passage which states crests could have been
ideal methods for attracting mates. The writer contends that and large crests
of male were preferred by female.
Also, according to the lecturer, the crests
might not had used for fighting. The crests are extended backward, while it
might have been forward to get an advantage of combat. Not only that, the
crests of Lambeosaurus are very fragile when compared to horns of Triceratops. This
refutes the reading passage’s assertion that the crests might have been used for
combat. The writer insists that they were used for both helmet to defend themselves
from predators and weapon to strike other members of its species.
Final point made by lecturer is that the
crests don’t look like an air supplier. This is because, their body is too
massive to get an oxygen from the crests which are very small. Only a few additional
seconds could be given to the dinosaur, which can be altered by taking a big
breath. This counters the writer’s claim that they could have been used to save
air and provide it when necessary. The writer maintains that it might have
helped them to keep their heads underwater when seeking aquatic plants. |