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
생물위성은 우주에서 생명체를 연구하는 데 사용됩니다.saengmulwiseongeun ujueseo saengmyeongcheoreul yeonguhaneun de sayongdoemnida.Biosatellites are used to study living organisms in space.