This development aims to produce an Electronic LKPD Based on Critical Thinking with PBL on quality Class X Environmental Change Materials. The research was carried out at the Biology Education Study Program, FKIP Riau University and SMA Negeri 1 Teluk Kuantan from January to March 2022. The research subject was KD 3. 6 material on environmental changes in class X SMA. The type of research used …