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source: https://www.researchgate.net/profile/Suleiman-Alhaji-Ahmad/publication/355752364_Instructional_Resources_in_Teaching_Basic_Science_Subjects_in_Secondary_School_s/links/617c0f8f3c987366c3ffedd7/Instructional-Resources-in-Teaching-Basic-Science-Subjects-in-Secondary-School-s.pdf