Hello! i need to know what other teo variables should have been controlled in this method! thank you

the endomembrane system is a series of compartments that work together to package, label, and ship proteins and molecules. in your cells, the endomembrane system is made up of both the endoplasmic reticulum and the golgi apparatus. these compartments are folds of membranes that form tubes and sacs in your cells.

idk

explanation:

well, i believe that the answer is 2. : 3