Answer to Question 1
D
Diffusion is the process by which substances move back and forth across compartment mem-branes until they are equally divided.
Answer to Question 2
A
Milk products inhibit the absorption of iron. Iron is better absorbed if vitamin C is in the ga-strointestinal tract at the same time, so drinking orange juice with the ferrous sulfate is beneficial. Capsules and enteric-coated iron preparations should not be opened or crushed. Whole grains are not known as inhibitors of iron absorption.