▶ Your Answer : The lecturer argues that crests had not played
the roles that the reading passage mentioned. This contradicts the reading
passage’s claim that crests may have played three roles.
First, the lecturer argues that the crests is
not for attracting mates. Because crocodiles, similar kind of animal, use
behavior sounds to call or obtain mates. They move their hands up and down on water,
and it makes sound. Dinosaur is similar reptile animal and maybe have used
similar way.
This casts doubt on the reading passage’s
claim that the crests may have been used to attract mates.
Next, the lecturer claims that the crests
may not be proper to use as weapon and protector.
The crests grows backward and have small
hollow passage. So they are not as strong as horns. It may not give enough damage
as weapon and protection from predators.
This counters the reading passage’s claim
that the crests may have functioned as protective helmets and weapon.
Finally, the lecturer points out that the
crests may not have been used for breathing underwater. Lambeosaurus are really
big dinosaur. This means they needs big amount of air to breath. But as seen in
the fossil’s records, the passage in the crest is too small to send enough air.
This refutes the reading passage’s claim that the crest may have been used to supply
air underwater. |