The phopholipid tail is

The phopholipid tail is hydrophobic, since it is composed of two fatty acids.

Explanation:

Phospholipids are the fat molecules that mainly compose the cell membranes, forming a double layer.

The phospholipid molecules are formed by glycerol and phosphate group, located in the head, and a tail formed by fatty acids.

The pole formed by the phosphate group is hydrophilic —since it is polar in nature— while the end formed by fatty acids, the tail, is hydrophobic.

In the plasma membrane, the hydrophobic end is located towards the surface, while the hydrophilic portion is located in the center of the lipid bilayer.

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