X: Ozone layer destruction
Y: Mass extinction
Phospholipid bilayers are critical components of cell membranes. The lipid bilayer acts as a barrier to the passage of molecules and ions into and out of the cell. However, an important function of the cell membrane is to allow selective passage of certain substances into and out of cells.
Answer:
C name it as the source of information
Usually by the neck or the metal piece of where you put your eye.
