This research aims to develop the Student Training Worksheet (LKPD) with the ethnics-based Search, Solve, Create, Share (SSCS) model and critical thinking on the high school class X ecological material in March-December 2019. The research was conducted in two places, namely to LKPD validation was conducted at the FKIP UNRI Biology Education Campus and LKPD limited trials were conducted at SMAN …