Answer:
- Phosphate group head
- Two fatty acid tails
Step-by-step explanation:
A phospholipid is made up of a phosphate group head and two fatty acid tails. They are connected by a molecule of glycerol.
To form cell membranes, phospholipids line up with their hydrophilic (water loving) heads on the outside of the cell and their hydrophobic (water hating) tails inside.
A second layer of phospholipids forms with the heads facing inside the cell and tails facing away. This forms a double layer - with the phosphate group heads on the outside, and fatty acid tails on the inside. This double layer, called a lipid bilayer, forms the cell membrane.