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
습지성 생태계는 다양한 식물과 동물의 서식지입니다.seupjiseong saengtaegeneun dayanghan sigmulgwa dongmul-ui seosikjiibnida.Wetland ecosystems are habitats for various plants and animals.