The author states the theories about the main cause of extinction, and provides three reasons of support. However, the professor explains that these theories were not the cause of Steller’s sea cow population decline, and refutes each of the author’s reasons. The reading posits that the sea cows were overhunted by the native Siberian people. On the other hand, the professor explains this point by saying that the sea cow was a mass creature with nine meters long heavy body. He states that the Siberian people were very less in number, however, they might have killed small number of sea cow because they do not need a lot sea cow. So, it proves that sea cow was not extinct due to native people, it might be another reason.
The reading claims that
The reading claims that