The student clearly states the independent variable as the concentration of microplastics in soil and the dependent variables as the concentrations of chlorophyll a and b in Common Oats, indicating a solid understanding of the research question. The methodology is well described, detailing the analysis method of measuring absorbance at specific wavelengths, allowing for reproducibility. However, the student does not adequately explain the choice of techniques for measuring chlorophyll concentrations, nor do they specify the sampling technique used for microplastics, which affects the validity of the experiment. Additionally, there is a lack of discussion regarding the number of trials and controlled variables, which are essential for ensuring reliability and consistency in the results. Despite these gaps, the student effectively addresses safety, ethical, and environmental issues, demonstrating a comprehensive awareness of the investigation's broader implications.
