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Which of the following is NOT a characteristic of hair?

  1. Density

  2. Color

  3. Elasticity

  4. Porosity

The correct answer is: Color

All of the other options are considered characteristics of hair. Density refers to how thick or thin someone's hair is, while elasticity describes how flexible or resistant it is to stretching. Porosity refers to the ability of hair to absorb and retain moisture. Color, on the other hand, refers to the pigmentation of the hair and is not considered a characteristic.