The student has effectively outlined a method that is appropriate for the research question, systematically varying salinity and measuring dissolved oxygen while controlling other factors. The method allows for the collection of relevant and sufficient data, with 8 concentrations and 5 trials each providing adequate data points for analysis. The student has described the proposed method in sufficient detail for replication, clearly outlining the sampling approach and providing reasoning for their method of sample preparation to enhance precision. However, the student did not adequately address safety risks associated with the method, nor did they fully explore ethical considerations, which could have added depth to their exploration. Nonetheless, environmental considerations were properly noted, emphasizing the lack of harm from the materials used.
