Bader Hamad, Z. 2021. The Effect of the Integration of the Strategies of the Flipped Classroom and the Hot Chair in the Achievement of Biology Among the Fourth Grade Students and the Development of their Critical Thinking. College of Basic Education Research Journal. 17, 2 (Jul. 2021), 217–243. DOI:https://doi.org/10.33899/berj.2021.168497.