THE EFFECT OF THE PBL LEARNING MODEL BASED ON SCIENCE, TECHNOLOGY, ENGINEERING, MATHEMATICS (STEM) ON THE COGNITIVE ABILITIES OF JUNIOR HIGH SCHOOL STUDENTS 1 BASA AMPEK BALAI TAPAN. universe [Internet]. 2022 Jul. 31 [cited 2026 Aug. 14];3(1):14-9. Available from: http://universe.ppj.unp.ac.id/index.php/universe/article/view/134