The lecturer casts doubt on the author's point about the migration hypothesis, which makes the points introduced by both the author and the lecturer contradictory to each other.
First, The lecturer refutes the argument by stating the weather condition is much warmer 100 years ago than now, and the sun could shine for 20 hours even in the coldest area on earth in Arctic. It is nothing like the cold and dark climate mentioned in the passage, on the contrary, the daylight is adequate for vegetables to grow and can foster died nutrition for the dinosaurs when the weather turns cold.
Second, although evidence suggests that edmontosaurs lived in the herds , there are still other explanations to that. One is the herds provide an extra protection from the predator and it is safe for the dinosaurs to live in such an environment. Also, the lecturer takes the elk for an example to state that there are other animals who live in the herds not for migrating purposes.
Third, the edmontosaurs adults are indeed physically capable of migrating for long distances. But what about the juveniles? They are not ready for such a distance due to their immature body conditions. And the lecturer also adds that the herds can not leave the juvenile behind due to that factor.
In a word, the lecturer perfectly prove evidence that are paradoxical to the points mentioned in the passage.
First, The lecturer refutes the argument by stating the weather condition is much warmer 100 years ago than now, and the sun could shine for 20 hours even in the coldest area on earth in Arctic. It is nothing like the cold and dark climate mentioned in the passage, on the contrary, the daylight is adequate for vegetables to grow and can foster died nutrition for the dinosaurs when the weather turns cold.
Second, although evidence suggests that edmontosaurs lived in the herds , there are still other explanations to that. One is the herds provide an extra protection from the predator and it is safe for the dinosaurs to live in such an environment. Also, the lecturer takes the elk for an example to state that there are other animals who live in the herds not for migrating purposes.
Third, the edmontosaurs adults are indeed physically capable of migrating for long distances. But what about the juveniles? They are not ready for such a distance due to their immature body conditions. And the lecturer also adds that the herds can not leave the juvenile behind due to that factor.
In a word, the lecturer perfectly prove evidence that are paradoxical to the points mentioned in the passage.
