Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
활력론은 생명체의 본질을 설명하는 중요한 이론이다.Hwalryeokron-eun saengmyeongche-ui bonjil-eul seolmyeonghaneun jungyohan il-eonida.Vitalism is an important theory that explains the essence of living beings.