What characteristic of phospholipids causes semipermeability of the cell membrane

they are amphipathic molecules.

Explanation:

phospholipids have both hydrophobic and hydrophilic regions, making them amphipathic.

its correct on Khan Academy

Answer: The hydrophilic phosphate heads are in the outside layer and exposed to the water content outside and within the cell. The hydrophobic tails are the layer hidden in the inside of the membrane. The phospholipid bilayer is most permeable to small, uncharged solutes.

Explanation:

The phospholipid bilayer is permeable to small, uncharged solutes.