Toelf Exercise 1

The lecture of the professor establishes other valid theories related with the extinction of the dinosaurs in the Cretaceous-Tertiary period. Although, she agrees that the 'impact-theory' is the most accepted by the scientific community. But, There are other such relevant theories to explain alternatives diffent to the massive extinction.

The first one is the natural evolution of species. This theory extent that the dinosaurs extinct because they could not adapt them to new condition of environment. In fact this point, expresses a situation where some of these animals were already extinct when the asteroid hit the earth. In opposition to the text that said that most of these animals extinct in a massive event.

This theory gains more support, when the scientists understand that the birds are probable evolve from carnivore dinosaurs. The birds adapt to the new conditions as many other animal like mammals and reptiles. This point is the most contradictory to the massive extinction one. Evolution from dinosaurs to birds is the consequence of millions of years of changes like volcanoes eruptions, climate change and other situations that are common in life evolution.

Finally, the professor agrees the text, but also presents other interesting ideas that puts some of the strong arguments of the impact theory in doubt an massive extinction.