▶ Your Answer :
Both the reading
passage and the lecture deal with the roles of an axe-shaped crest of
Lambeosaurus. In the lecture, the speaker asserts that theories suggested in
the reading are groundless. This casts doubt on the reading’s point that recent
research has shown that physical feature of the crests may have played.
To
begin with, the lecturer contends that it is doubtful that the crests may have
been used to attract opposite sex. Most of reptile use their behavior to
attract mates. For example, Crocodiles use their growling noise to be noticed
by potential mates. Lambeosaurus might use the method which is the same to that
of crocodiles. Therefore, the crest of Lambeosaurus would not have been used to
attract mates. This counters the reading passage’s assertion that the crests of
Lambeosaurus may have been utilized to attract potential mates.
In
addition, the speaker argues that it is hard to believe that the crests were
used for battle. Fossil records have indicated that the crests were stretched
backward, whereby Lambeosaurus could not combat with each other and defend
themselves using the axe-shaped crest. Furthermore, Triceratops’ crests were
hollow and too fragile. Thus, the crests might not be used to fight each other.
This rebuffs the reading passage’s insistence that the crests of Lambeosaurus
were used for combat.
Lastly,
lecturer states that the function of the crests was to supply air when
Lambeosaurus immersed their head underwater to eat aquatic plants. Lambeosaurus
was a huge creature, so it needed large amounts of oxygen; however, the crests
were too small to contain enough amounts of oxygen. Lambeosaurus would have breathed
deeply as foraging the aquatic plants. Hence, the creatures would not have used
their crests to supply air. This is contradictory to the reading’s claim that
the crests of Lambeosaurus were used to complement air while their head were
immersed in water. |