Which feature is not a protective characteristic of the skin?

The feature that is not a protective characteristic of the skin is high pH. The skin's pH is typically slightly acidic, ranging from about 4.5 to 5.5. This acidity helps inhibit the growth of pathogenic microorganisms.

Keratinization refers to the process by which skin cells become filled with keratin, a protective protein that makes the skin tough and waterproof, serving as a barrier against environmental damage. The acid mantle, formed by sebum and sweat, creates an acidic surface on the skin that protects against microbial colonization and infections. Desquamation is the natural process of shedding dead skin cells, which helps to remove any microbes that might adhere to the surface and contributes to overall skin health.

Therefore, the correct answer highlights that high pH does not serve a protective role for the skin, while the other features contribute to its protective functions.