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
바다눈은 해양 생태계에서 중요한 역할을 합니다.badanun-eun haeyang saengtaegyeeseo jungyohan yeoghal-eul hamnida.Marine snow plays an important role in the marine ecosystem.