Some of the epithelial cells are folded or wrinkled what does this tell you about the thickness of the cells?

This means that the cells are in a hypertonic solution.

Explanation:

A hypertonic solution is precisely one that has a higher solute concentration compared to another medium, which in this case is the epithelial cells, shown in the question above.

When a cell is in a hytonic solution, it tends to lose fluids to that solution in order to balance the concentration of solute within the cell and in the solution. As a result, the cell is deformed, wrinkled, folded, withered.