The student provides clear and focused background information on preservatives that is relevant to this experiment. The student clearly explained the influence of pH on enzyme activity. The methodology of the investigation is highly appropriate to the topic and includes appropriate steps to assure the relevancy and validity of the obtained results. The methodology is focused on answering the research question and the student shows full awareness of safety, ethical, and environmental issues that can arise during the experiment. However, the description of the main topic is to some extent present in the introduction but the main topic was not introduced.
