Extinction

As for the extermination of the dinosaurs the only solid fact is that no wraith of dinosaur has been found after the Cretaceous. This c everys for ideas of their sudden disappearance, and a gravid numbers of theories have been proposed, m both of which with a orientation course for the dramatic. It should be emphasise, however, that at that place is no reason to recall that the dinosaurs disappeargond suddenly. And there is neither any reason to think that they disappeared because they all died! All animals die, however extinction happens because lesser new are born than die. The dinosaurs were a real neat success and the superiors of their judgment of conviction with no competition from another(prenominal) vertebrates. The mammals, which did exist during the entire dinosaurian period, were small nocturnal animals, which played only little or no billet to the dinosaurs. At the beginning of the Triassic discordant other groups of reptiles, which had survived the great ext inction, took their place in the bionomic system of the Mesozoic. Those were the diapside reptiles, which evolved into the quadrupedal, sprawling lizards, and the herbivore rhynchosaurs, but the former stayed small, and the latter were slow, cumbersome animals, which died out during the Mesozoic. The birds arose during the reign of the dinosaurs, and as well did the flying reptiles, the pterosaurs, but no(prenominal) of these met the dinosaurs with any kind of competition, neither did the amphibian archosaurs, phytosaurs and crocodiles, and nor the various species of sea-living reptiles, the ichthyosaurs and the plesiosaurs. From the warmness Triassic the stage was entirely set apart for the dinosaurs, and they constituted approximately exclusively an eco-system of their own. This system was based on the tall plant-eaters, the sauropods, the various ornitischians, and eventually on the bird-like, plant-eating ornithomimians. These plant-eaters drifted in hosts over the landsca pes and consummated... ! If you compliments to get a full essay, rear it on our website: BestEssayCheap.com

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