The student clearly states the independent variable, which is the concentration of sodium chloride (NaCl), and the dependent variable, the growth and development of tomato plants (*Solanum lycopersicum L.*), in the research question. The methodology is well described, detailing the steps of the procedure and the materials used, allowing for reproducibility. While the student effectively discusses controlled variables and safety, ethical, and environmental considerations, there is a lack of justification for the choice of measurement techniques and sampling methods, which should be addressed for clarity. Overall, the student demonstrates a thorough understanding of the experimental design, but could strengthen the justification of their methodological choices.
