The lipid bilayer is known to be firmly set up as the universal basis for cell-membrane structure. The two species in the table that should have much more phospholipid are Species A and B
Lipid bilayer can be seen by electron microscopy, through a specialized techniques, such as x-ray diffraction and freeze-fracture electron microscopy.
The bilayer structure is known to be a characteristic special properties of the lipid molecules, that makes them to assemble spontaneously into bilayers as seen in simple artificial conditions.
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