The student clearly stated the independent and dependent variables in the research question, identifying the initial metal-ion concentrations as the independent variable and the adsorption efficiency of bagasse biochar as the dependent variable. The methodology was well described, with a clear explanation of the sampling technique and controlled variables, ensuring reproducibility of the investigation. The student effectively discussed measurement precision and the number of trials, which contributed to the reliability of the results. However, there were gaps in addressing ethical and environmental issues, as the student did not explain the rationale behind the choice of concentrations or provide details on waste disposal methods. Overall, the methodology was detailed and relevant, but improvements were needed in the ethical and environmental considerations.
