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Purba ST, Rajagukguk S, Yana MD. ANALISIS KESULITAN BELAJAR SISWA DALAM MEMAHAMI MATERI SISTEM REGULASI MANUSIA DI KELAS XI SMA SWASTA KARTIKA 1-4 PEMATANGSIANTAR TAHUN AJARAN 2020/2021: ANALYSIS OF STUDENTS’ LEARNING DIFFICULTIES IN UNDERSTANDING THE MATERIALS HUMAN REGULATION SYSTEM IN CLASS XI SMA PRIVATE KARTIKA 1-4 ADMINISTRATION FOR THE 2020/2021 ACADEMIC YEAR. JMO [Internet]. 2021 Oct. 30 [cited 2024 May 21];3(2):24-33. Available from: https://jurnal.usi.ac.id/index.php/metabio/article/view/40