Lemons contain more citric acid.
The answer is:
A) light microscope
<span>The Krebs cycle uses acetyl CoA as a reactant.</span>
The step that is missing in their methodology is DATA ANALYSIS.
Data analysis is a very important step in scientific investigation. It is the phase of the scientific investigation where the results obtained from the experiment are gathered, examined and analysed in order to obtain necessary information from the data.