1 Aden, Yemen is at 12 49'N, 45 1'E, 3 m (10 ft). 2  See map. 3  Aden has a subtropical desert / low-latitude arid hot climate (K ppen-Geiger classification: BWh). 4  The annual average temperature is 29.2 degrees Celsius (84.5 degrees Fahrenheit).
The core of a sphingolipid is an amino alcohol called sphingosine. Complex sphingolipids located in the plasma membrane of animal cells (especially nerve cells) have a structural function and are believed to protect the cell surface from harmful environmental factors.
The phospholipids make up most of the cell membrane, the cell  membrane controls what goes in and out of cells and the  phospholipids helps with this because the 'heads' are â¦ hydrophilic  and the 'tails' are hydrophobic. phospholipid is made up of a hydrophobic (water-avoiding) tail and a hydrophilic (water-liking) head. the OH group in C1 is esterified with a saturated Fatty acid. the OH group iin C2 is esterified with unsaturated fatty acid.