Put the protein digestion steps in order of their occurrence during the digestive process

Step 1: Mechanical degradation of protein-rich foods in the mouth.Step 2: Denaturation of proteins in the stomach by hydrochloric acid.Step 3: Breaking down the protein of food into peptides and some free amino acids in the stomach by the pepsin enzyme. Step 4: The resulting products (peptide-polypeptides) are passed into a duodenum. Here, the polypeptides are further degraded to the oligopeptides and amino acids by the trypsin enzyme.Step 5: In the small intestine, along with the last stages of degradation, begins the process of absorption of degradation products into the blood. 

You should never redesign your experiment. try and see what in your experiment you made a mistake on or try and test your experimemt with somebody else. see if they get the right results.