Sandfish (Holothuria scabra) is one of animal on the sea which has important economic value. This commodity has good prospect in intemational and local market. The contamination of heavy metal waste from industrial activity gives influencing to Sandfish in their natural habitat and cultivation location. The aim of this research was to know the level of heavy metal toxicity especially cadmium me…
This study aims to see how the implementation of the problem-based learning model and its influence on students' critical thinking skills in class XII PPKn subjects at SMA Negeri 5 Talang Ubi. The research was conducted using a quantitative approach with a quasi-experimental design method. The research population was all class XII of SMA Negeri 5 Talang Ubi with the number of 83 students. The s…