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
지표종은 생태계의 건강을 나타내는 중요한 역할을 합니다.jipyojong-eun saengtaegye-ui geongang-eul natananeun jungyohan yeoghal-eul hamnida.Indicator species play an important role in indicating the health of an ecosystem.