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
지구의 생물권은 다양한 생물들이 살아가는 공간입니다.jiguui saengmulgwon-eun dayanghan saengmuldeuri sal-aganeun gongganimnida.The biosphere of the Earth is a space where various organisms live.