The student clearly states the independent and dependent variables in the research question, however, the unit for the concentration of ions is missing. The student describes the method of analysis conducted and provides extensive background theory directly relevant to the research question. The student also explains the choice of techniques used for measuring the independent and dependent variables and discusses the choice of various temperatures for spinach treatment. However, the student needs to provide a brief explanation of the choice of the sampling technique applied. The student identifies and addresses safety and ethical issues associated with the investigation, but needs to elaborate on the environmental issues related to the presence of toxic chemicals in the experiment. The methodology is sufficiently described, and there is no irrelevant or repetitive information included, allowing for the investigation to be reproduced.
