I today went to Seodaemun museum of history. Before 46years ago, Earth was created. There was a big bang, and later Earth was made. At first, Earth was just a big rock filled with magma. But after a long year, the heat got smaller and weaker. So the living things finally appeared with the structure of bacteria. The famous one is called "Cyanobacteria". These made us and other living things on the ground can breathe with oxegen. This age is called,"Precambrian era". Next, "Palezonic era" was the tarning point of living things. The amphibians, reptiles, and plants showed themselves in the world. And then, there was "Mesozoic era", the age of dinosaurs. Finally, in "Cenozoic era", we mammals were borned.

   Also there is an evolation on humans. The first people was Australopithecus. There are olmost similar to a monkey. Secondly, there were Homo habillis which is the first user of stone tools. Next humans were homo erectus. There were smarter than other humans before, so they founded how to utilize the fire. Next was Homo sapiens and finall stage was Homo sapiens sapiens.

   These were the important facts about museum of history. Because of this point all love to study about living science and about the ground of Esrth.