Suprapto, P.K., Aji Riyanto and Nuryadin, E. 2020. Wimba learning strategy with PjBL model: How the effect student in excretory system concept?. Biosfer: Jurnal Pendidikan Biologi. 13, 2 (Oct. 2020), 292-306. DOI:https://doi.org/10.21009/biosferjpb.v13n2.292-306.