I think it’s distance traveled
Answer: Vacuole
Explanation:
Vacuole is a cell organelle that is lined with membrane and filled with cell sap that serves as a storehouse for many substances especially water. Hence, the cell membrane helps to remove excess water in cells
Valence is the number of electrons an atom must gain or lose in order to consummate its outer energy level or have a stable octet in its outer shell
The expression would be $0.20 x f. Once you figure out what the 'f' variable stands for, you have to multiply it by $0.20, and you will have your answer.