B. II, IV, V, VII, d. I, IV, V, VII, “7. What is the skins natural oil?”, a. Sweat c. Sebum, b. Melanin d. Vegetable oil, 8. What system is composed of the mouth, esophagus, stomach, small, intestine, and large intestine?, a. Digestive System c. Respiratory System, b. Circulatory System d. Excretory System, 9. Where does digestion begin?, a. nose, b. esophagus, c. mouth, d. rectum, 10. Where does final digestion take place?, a. small intestine, b. large intestine, c. esophagus, d. mouth