Ritonga, I.; Simatupang, H. Pengaruh Model Problem Based Learning Terhadap Kemampuan Argumentasi Ilmiah Peserta Didik Pada Materi Ekosistem Di Kelas X SMAN 2 Medan: (The Effect of Problem Based Learning Model on Students’ Scientific Argumentation Ability on Ecosystem Material in Class X SMAN 2 Medan). Biodik 2025, 11, 119-125.