Today, I';; tell you about the prehistoric age. First, we could divide the prehistoric age into 3 ages by the tools. Stone age was when people use tools from stone, and Bronze age and the iron age was when they use bronze and iron. When the ages change to the next many things change not only tools. In the old stone age, they used fire for the first time. and in the new stone age, they started farming. In the bronze age, people have ranks. Because of this in the old stone age, they could cook the food in fire, so it's soften. So people didn't have to had sharp and hard teeth. and people of the new stone age, started to live in one place. and make potterys. I bronze age, because of the ranks, dangun could estbilsh gojoseon the first country in Korea.

 History really change a lot by a one change.

 Thank you for listening.                                   -end-