Joy C. Chukwu & J. W. Dike 2019. Effects of Jigsaw-puzzle and Graphic Organizer Instructional Strategies on Biology Students’ Performance in Abia State. Archives of Current Research International. 18, 3 (Sep. 2019), 1–6. DOI:https://doi.org/10.9734/acri/2019/v18i330139.