A team of students is performing an experiment to determine how the speed of a reaction between HCl and Na2CO3 changes with temperature. The aspect of the experiment that does not have to be kept constant would be the initial concentrations of the reactants. Hope this helps. Have a nice day.
Anatomy is the study of human body parts, while physiology is the study of the functions of said body part. So anatomy is what the body part is, and physiology is what that body part does.