I have my Group Fitness Instructor exam scheduled for tomorrow, so I am of course going through my practice exams. AFAA should know that there is a huge mistake in one of their questions: Which of the following is a function of blood? Select one: a. Immunity b. Filtration c. Digestion d. Transportation (Correct) As I hold a Master of Science degree, I believe this question to be extremely amateur, seeing as the answer a. Immunity is also a valid answer to this question. I sincerely hope the actual AFAA exam I take tomorrow is more legitimate than this mildly unprofessional online course, which, mind you, costs over $500. If it is not an accurate or professional exam, this company will be hearing from me.