Rosmana A.P | Science | Scientific Facts

Reptiles are grow rapidly in the primitive era. Especially in Triassic Era, around 215 million years ago. It start when a species named "Thecodont" develop it's feet. Not like another reptile species that can't stand erectly, Thecodont can stand erectly, it because the "development" at it's feet. Then, this species grows into the first vertebrate that can stand erectly, "The Dinosaur."

Dinosaur means "A Horrible Lizard." This group got it's name because when it's fossil was found at the first time, the founder of the fossil saw how large the size of the fossil. Because it's heavy size and from the research they found this creature was carnivorous animal, it was named "Megalosaur."

After that many others large fossils were found. One of them is an "Iguanodon's fossil", this species named Iguanodon because it's jaw are shaped look like an Iguana's jaw, the different between the jaw is only it's size, an Iguanodon's size are bigger more times. An Iguanodon is a herbivorous animal. After that, researcher found these giant creature groups are already extinct, then the researchers named these creature group "Dinosaur."

This group was live in three eras: Triassic, Jurassic, and Cretaceous Era. This group was divided into two kind of dinosaur based based on it's pelvis:"The Saurichian Group" that most of all were carnivorous and "The Ornithichian Group" that most of all were herbivorous. The Saurichian Group's pelvis are shaped like the pelvis of lizard. But, The Ornithichian Group's pelvis shaped like the pelvis of bird.

The dinosaur controled the world until the end of Cretaceous Era around 65 million years ago. After that, they suddenly dissapeared (extinct). No one know why the dinosaur become extinct. This mystery was sayyed as one of the biggest scientific mysteries. In the 19th century, appear a theory that know as "The Meteor Collision Theory." This theory say in 65 million years ago, a giant meteor collide to earth surface. Because the meteor has a large diameters, a rub with the earth's atmosphere doesn't make the meteor dissapeared. Then, this meteor blows the earth surface and fly many dust that form many dust clouds that cover the earth in a long time.

The dust cloud are very thick, because of it's thickness, sunshine can't reach the earth surface. Because of that, many primitive plants become die because can't do photosynthesis for it's life. bacuse that, many herbivorous dinosaur can't live because the primitive plant as it's food die. Then, the carnivorous dinosaur loss their prey and become extinct due starvation. But, the dinosaur extinction still a mystery due there are only a few evidence for the dinosaur extinction.