The student clearly states the independent variable as the concentration of iron(II) sulfate and the dependent variable as the enzymatic activity of catalase, measured by pressure increase. The methodology is well-described, detailing the procedure and materials used, which allows for reproducibility. However, the student fails to provide sufficient background theory relevant to the research question, does not explain the choice of techniques for measuring variables, and lacks justification for the sampling technique. Additionally, the student does not address safety, ethical, or environmental issues related to the investigation, which are important aspects that need to be considered.
