The lecturer and the reading passage discuss the migration of edmontosaurus, the elephant-sized dinosaur. The professor claims that the hypothesis that the edmontosaurus migrated every winter is not convincing. This counters the reading passage’s claim that there are several evidence supporting the migration of edmontosaurus.
To begin with, the speaker asserts that edmontosaurus did not have to migrate to find food. At that time, the summer temperatures in the North Slope area were warmer than today. Also the sun shines shone 24 hours a day at peak of the summer. With both condition, there were tremendous amount of plants for the edmontosaurus to feed, even in the winter. This contradicts the reading passages claim that edmontosaurus migrated to the south due to the food shortage.
On top of that, the speaker mentions that edmontosaurus had lived in herds does not mean that they migrated. A lot of animals live in herds for many other reasons. For example, living in herds provides animals with extra protection from predators. This is the opposite of the reading passage’s claim that edmontosaurus migrated because migration is proved by the fact that their fossils have been found in herds, where migration animal mainly live.
Finally, the speaker argues that edmontosaurus’s anatomical feature does not support the theory of their migration. This anatomical feature is only found in adults edmontosaurus. However, and juvenile edmontosaurus did not develop yet for this structure. Therefore, long distance migration is must have been (was도 가능함. 어쨌든 과거로.) too difficult for juvenile edmontosaurus. This refutes the reading passage’s claim that edmontosaurus were anatomically capable of migrating long distances.
Writing 0-30 scale
Fair (24-25)
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