the Mesozoic era started about 250 million year when the first dino apeird and 65 million years when the finally dino died
dinosuarse where around at time period there where about 540 have been named. Recent estimates suggest that about 700 to 900 more dinosaur and some plant are cycads, cycadeoids, ginkgoites, ginkophytes, conifers, glossopterids and angiosperms.
but the dinosaures whint extinct by one on thie reason
Where Did All The Dinos Go? Some Leading Theories A big meteorite crashed into Earth, changing the climatic conditions so dramatically that dinosaurs could not survive.
Ash and gas spewing from volcanoes suffocated many of the dinosaurs.
Diseases wiped out entire populations of dinosaurs.
Food chain imbalances lead to the starvation of the dinosaurs.
`the Mesozoic era was geting dpending on what time pereod your in