The student clearly stated the independent variable (pH levels) and the dependent variable (rate of carbon dioxide production) in the research question, allowing for a focused investigation on how pH affects enzyme activity. The methodology was well-described, including the choice of sampling technique and controlled variables, which ensured that the experiment would be reproduced. The student effectively addressed safety, ethical, and environmental considerations, demonstrating awareness of responsible practices. However, there was a lack of explanation regarding the techniques used to measure the independent and dependent variables, which needed to be addressed for a more comprehensive understanding of the methodology. Overall, the student provided a solid framework for their investigation, with clear and relevant information throughout.
