The student does not clearly describe how the data was obtained and processed, lacking specific details about measurement procedures and calibration of the CO2 probe, which hinders understanding of the methodology. However, the student provides detailed and precise descriptions of data recording and processing, with well-annotated tables and graphs that consistently use appropriate units and significant figures. Additionally, the student includes clear considerations of uncertainties, demonstrating how they impact the results through calculations of percentage uncertainty and the use of error bars. The validity of the conclusions is upheld, as the methodology and results are coherently outlined, supported by statistical analysis. Nonetheless, the student should improve data processing transparency by explicitly stating calculations for mean CO2 production for each substrate.
