The student provides a focused and detailed description of the main topic, clearly articulating the aim of the investigation and specifying the research question regarding the effect of sodium bicarbonate on pepsin enzyme activity. Background information relevant to the experiment is well-presented, including explanations of the biological processes involved and references to prior studies. The methodology is appropriate and specifically designed to answer the research question, with steps taken to ensure the validity and relevance of the results. However, the student lacks full awareness of ethical and environmental concerns related to the experiment, as these aspects were not adequately addressed. Overall, the investigation is well-structured and comprehensive, though there are minor mistakes or imprecisions that led to a small decrease in the Criterion score.
