Risjunardi Damanik
ORCID iD Department of Biology Education, Universitas Simalungun
Indonesia

Nursahara Pasaribu
Department of Biology, Faculty of Mathematics and Natural Sciences, University of North Sumatra
Indonesia

Etti Sartina Siregar
Department of Biology, Faculty of Mathematics and Natural Sciences, University of North Sumatra
Indonesia

Syamsuardi Syamsuardi
Department of Biology, Faculty of Mathematics and Natural Sciences, Andalas University
Indonesia