The plasma membrane is a phospolipid bilayer.
The reason why we call it a phospholipid bilayer is because it's created exactly out of that - phosphobilipids :)
Phosphorous (chemical element) + bi (means two) + lipid (means fat)
Sorry but there is no image lol
Fixation or volatilization, mineralization, nitrification, immobilization, and denitrification.