[A]: Passive absorption of a substance oc- curs from its lower to higher chemical poten- tial across the membrane.
[R]: Active absorption occurs across a mem- brane from its higher to lower chemical po- tential i:e., along the concentration gradient
A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false
