I went to Seodaemun Museum of Natural History. In 3rd floor there is about Earth environment. I learn that Earth was formed in crust ( ground ), metal. Next we saw fossil. there is not the biggest dinosaurs, the URTRAsaurs.

 I learn about Cyanobacteria. Cyanobacteria is first bacteria in the earth. Cyanobacteria give oxygen . in Precambrian Era many bacteria live. in Palezoic Era plants, insects, reptile, fish , and amphbian live. In Mesozic Era dianosaurs live. Lastly, in Cenozoic Era mammal live.

 Person have evoultion. First there is  Australopitacos and Homor erectus and Neanderthalan men and homor Sapience. People is Homor Sapiense Sapience.