The student clearly stated the independent variable as the salinity of water and the dependent variable as the amount of dissolved oxygen, with a specific method of analysis using Winkler's method. The background theory was well-developed, providing relevant concepts that establish a foundation for the investigation. The methodology was thoroughly described, including the preparation of solutions and precise measurements, which ensured the reproducibility of the experiment. Additionally, the student effectively addressed controlled variables, safety, ethical, and environmental considerations, demonstrating a comprehensive understanding of the research process. Overall, the methodology was presented clearly and concisely without irrelevant information.
