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TOPIC The mesozoic era is divided into three time spans triassic,jarassic and cretaceous. The mesozoic era or age is when the dinosaurs came in and the time they got extint.The mesozoic era was the time from 248 to 65 million years ago.It has the Triassic period when all the early dinosaurs came in,the Jarassic period when new groups of dinosaurs and mammals appeared and the Cretaceous period when all the dinosaurs became extinct.

In the beginning of the Triassic period there were no dinosaurs but many amphibians,reptiles and dicynodonts.In the Triassic the first true dinosaur appeared about 215 million years ago. Dinosaurs lived on earth for the next 150 million years.During the late Triassic period,220 million years ago,the first true mammal appeared,like Eozostrodon.248 million years ago the Permo-Triassic extinction occured.This is the largest extinction known.About 90% of all speices and 60% genera died out. Glossopteris was the dominate southern hemisphere tree during the Early Triassic period.

In the Jurassic period many more new groups appeared and the gigantic sauropod diversified.About 140 million years ago, the flowering plants evoled and it would soon change the face of the earth.The climate was very hot and dry,it was strongly seasonal.There was a minor extintion toward the end of the Jurassic period in which more than 80% of marine speices and other shallow water speices died out.Many giant sauropods lived in the late jarassic but sadly they went extinct and so as other giant dinosaurs.

The Cretaceous period is the heyday of the dinosaurs because that is when the tyrannosaurus rex and triceratops and many other dinosaurs came in.At this time the plants developed and would radically change the landscape.The Cretaceous period ended 65 million years ago with the extintion of dinosaurs and other prehistoric lifeforms.

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 * DID DINOSAURS REALLY EXIST?**

Dinosaurs did really exist because if they didn`t exist who would the fossils belong to and what lived on earth before us.If dinosaurs didn`t exist the fossils would`nt be in muesums but there is and there would`nt be any palaeontoligists and archeoligists if they didn`t exist but there is .The library would have less books and less readers if there was no information about dinosaurs but there are books about dinosaurs and there is lots of readers.There would`nt be any programs like digging up the past if there was nothing to study about and I wouldn`t be typing this if there was nothing to write about but i am writing this and we do have e~tasc so that proves that dinosaurs really exist.The dinosaurs do exist because all the fossils and bones didn`t belong to a hungry dog they had to belong to something and dinosaurs were the only thing that could match with it and if you put all the fossils together like a puzzle you would see a picture and the dinosaur was the picture.