The cell membrane is the membrane that can be found in both eukaryotic and prokaryotic cells. It is the cell that separates the interior of the cell from the extracellular environment. It is a protective layer that allows only the selected ions and organic molecules to enter inside the cells and go out of the cell, hence is called as selectively permeable or semi-permeable membrane. This phenomena maintains the concentration of ions and molecules inside the cell and prevents dehydration, cell rupture due to high concentration.
This is comparable to the impression of the 'sneaky' males
in the side-blotched lizard. Natural section favor an individual by the detector
or sensor will sustain less cost and increase an advantage and gain over others
incapable to distinguish the deceitfulness.