why women whome graduated in science and technology didnt work after graduating? what measures should government take to hepl this?

The reading passage lists three explanations to explain the reason why all living species were distinct in the past and the world was dominated by dinosaurs over the following 145 million years.

However

, the lecture rebuts all these explanations and pointed out there are flaws in these explanations one by one.

First,

the author claims that the

extinction

of these species was

due to

the dropping of sea level and its fluctuation destroyed the food chains, leading to the mass extinctions of all animals at that time.

However

, the lecture points out that there are flaws in

this

assumption and he goes on to say that the animals were capable to adapt to the changes in the environment taking place gradually, and the changes took millions of years to complete rather than happening overnight.

In addition

, the writer contends that the climate cooling caused by SO2 from volcanic activities should be blamed for the

extinction

.

By contrast

, the explanation was

also

challenged by the professor and he maintains that the SO2 cannot be condensed in a short period and the formation takes time.

Besides

, he mentions that SO2 can combine with water in the air to drop as rain. Under

such

circumstances, the concentration would be lowered.

Lastly

, the passage thinks that the asteroid strike should be responsible for the

extinction

of these species since the collision from these planets from outer space would block the sunlight from reaching the earth. Undoubtedly, the professor

also

cast doubt on

this

assumption and he backs up

this

argument by mentioning that the craters were formed 200 million years ago before the

extinction

, so it may be irrelevant with the

extinction

at all.