Phospholipid molecules makes up the lipid bilayer
The cell wall is the outside layer of the cell whereas the cell membrane is surrounds the cytoplasm of the cell.
A closed system is a system that makes no physical or chemical exchanges with its environment. Of these systems provided as choices (tree, human, clock, car), only a clock does not make exchanges with the environment, except for energy.
Therefore, of that list, only a clock would be a closed system.
Hope that helped! =)
The correct answer is "false".
The urine comes from the kidneys and will pass through the renal pelvices where they will form the ureters. The urine in the ureters will eventually flow to the urinary bladder where it is stored. Eventually, in urination, the urine is expelled from the urethra.
