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Sinaga, Odor Debora Pita Uli, Departmen of Biology, Faculty of Mathematics and Science, Universitas Negeri Medan (Indonesia)
Sinurat, Dian I, Universitas Negeri Medan (Indonesia)
Sipayung, Murdoni, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Sirait, Gloria, Department of Biology Education, Faculty of Teaching and Education, Universitas HKBP Nommensen
Pematangsiantar, Pematangsiantar, Indonesia (Indonesia)
Sirait, Ribka, Department of Chemistry- Faculty of Mathematics and Natural Sciences Universitas Negeri Medan
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