▶ Your Answer : The lecturer objects to the points
mentioned in the reading passage made about that dinosaur was cold-blooded
animal. The speaker states the points in the passage have flaws.
First of all, the speaker argues that the
claim about migration of dinosaurs, cold-blooded animal, is wrong. It is true
that the fossils of some dinosaurs has found in Australia, however there is
evidence to show a different view. That is because Australia was divided into
small islands at that time unlike today. Therefore, migrating to the other
lands was inefficient for dinosaurs and it was not easy to the young, so there
is high chance that they were stuck in the same area in coldest season. And this
means that dinosaurs were not likely to be cold-blooded animals, but
warm-blooded animals. This casts doubt on the author’s claim that dinosaurs
migrated to the warmer cites to avoid cold.
Second, the lecturer points out that the
argument regarding hibernation of dinosaurs is mistaken. If they hibernated,
they should have had LAG(Lines of Arrested Growth) which is similar to growth line of trees on their bone
which proves their growth were stopped for a while. However, analysis showed
there is no evidence for this. The result shows that dinosaurs were likely to
be warm-blooded animals rather than cold-blooded animals because they had to
survive in cold place without hibernation. This goes against the writer’s view
that the cold-blooded dinosaurs would have hibernated.
Finally, the professor contends that the opinion
concerning special adaption of cold-blooded dinosaurs to overcome cold is
flawed. If they lived in dark places with a big eye and good vision, they would
need to exposed to sunlight to keep their temperature since they were not able control
their temperature on their own. This proves that dinosaurs were warm-blooded
animal rather than cold-blooded animal. Therefore, this contradicts the idea
presented in the reading passage that cold-blooded dinosaurs had lived in place
which has little sunlight with the special adaption.
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