The reading and listening material focus on the explanations of the causes of the extinction in the Truassicc period. The reading points out that there are possible explanations. However, in the succeeding lecture, the professor contends that those reasons in the reading are not convincing for several reasons. 

First if all, the reading material proposes that the decline of the sea level causes the ocean animals become dead, thus destroyed the food chain and lead to the extinctions. Nonetheless, on the basis of the following lecture, the professor claims that the marine animals could adapt to the gradually changed environments. The change happened gradually and last for millions of years, and that could offer enough time for the costal species. 

Second, the reading passage suggests that the climate cooling might be one of the reasons. The volcanic activity released sulfur dioxide (S02) and made the global temperature decreased. However, based on the lecture, the S02 could just appear in the atmosphere for a short time and would be cleared out gradually though combine with the water in the atmosphere and eventually return to the earth as rainfall.

At last, the reading says that maybe the asteroid struck the earth and the thrown up materials blocked the sunlight. On the contrary, the listening argues that few scientists believed that view. It is because by using the crater date analysis, the craters just found 12 million years before the extinction, and it could be too early to cause that extinction.