NASTALIA, MESI; LESTARI, T. THE EFFECTIVENESS OF DISTANCE LEARNING IN SCIENCE STUDENTS DURING COVID-19 AT SMPN KECAMATAN KOTO XI TARUSAN, PESISIR SELATAN DISTRICT ON UNDERSTANDING STUDENT CONCEPTS. Universe, v. 2, n. 2, p. 204-212, 30 dez. 2021.