Khairil Hadi, Dazrullisa, Binari Manurung, Hasruddin
This paper was retracted by IOP Publishing on 12 December 2018. This paper was published due to a technical error and was not intended to be included in this journal. © Published under licence by IOP Publishing Ltd.
Department of Biologi Education, STKIP Bina Bangsa Meulaboh, Meulaboh, Indonesia; Department of Mathematics Education, STKIP Bina Bangsa Meulaboh, Meulaboh, Indonesia; Department of Biology, Universitas Negeri Medan, Medan, Indonesia
