Answer:
Protein digestion occurs mainly in the stomach thanks to the pepsin enzyme. Then digestion is completed in the duodenum
In the Arthropods experiment the control is not needed since c. the treatments can then be compared to each one rather than that of a control. Hope this is the right answer and would be of big help to your assignment.
6CO2 + 6H2O + light energy = C6H12O6 + 6O2.
-So the end products are glucose (C6H1206) and 6 oxygen molecules (6O2)