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Hendrika Saputra, Padilah and Ade Irwansyah Putra Nasution 2021. Effrctivenes Of The Biology Learning During The Covid-19 Pandemic Class X MIPA Mas Al Wasliyah Merbau North Labuhanbatu Regency. International Journal Of Humanities Education and Social Sciences. 1, 3 (Dec. 2021). DOI:https://doi.org/10.55227/ijhess.v1i3.74.