The Extinction of Dinosaurs

Human beings have lived on the earth for more than 4 millon years while the dinosaurs lived on the earth for about 200 million years.Compared with the time dinosaurs existed on the earth, the time of humans' existence is quite short

But why did the huge dinosaurs disappear from the earth? There is an idea that the earth suddenly became very cold at one time.

Since dinosaurs did not have the habit of hibernation, like snakes or tortoises, to keep themselves away from cold, or have fur to protect their body from cold, they eventually died out.There is another idea that everywhere was dark on the earth when the planets crashed into the earth and dust hid the sun.

A huge number of plants died and the dinosaurs as well as other animals which fed on plants gradually died.

As the number of animals decreased,the meat-eating dinosaurs were not able to find enough food to eat and eventually died.

There are some other ideas ,for example:more and more mammals lived on the earth and they stole dinosaurs eggs as food, causing the gradual disappearce of dinosaurs,the dinosaurs suddenly disappeared because of a strange infectious disease,the drop in global temperature made dinosaur eggs only hatch male dinosaurs.

These ideas in a way seem to have sense but they are not so convincing! Therefore, why dinosaurs became extinct is still a mystery which has not been answered up until now.

People now can only imagine how splendid the dinosaurs used to be by information from museums,films and books.

For me...remembering TONES ><

ah ni hao! wo ye hen ni gao xing ^^ jiayou!

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