<span>The phospholipid bilayer is a thin polar membrane made of two layers of lipid molecules. ... Biological bilayers are usually composed of amphiphilicphospholipids that have a hydrophilic phosphate head and a hydrophobic tail consisting of two fatty acid chains.</span>
All of the following are examples of properties of water except bouyancy
78% is nitrogen, 21% is oxygen, 1% is other.
The two main functions are replication and expression.
