Answer :
Final answer:
Vellus hair is fine, soft, usually downy hair that covers much of the human body. It helps regulate body temperature. Unlike glabrous skin found on human fingertips and lips, skin with vellus hair is less dense in touch receptors and less sensitive.
Explanation:
Vellus hair is categorized as option A: it is a type of fine, soft, usually downy hair. This type of hair is characteristic of the coverage found over much of the human body, including areas such as the arms, legs, torso, and face.
The key role of vellus hair is to help with the body's temperature regulation. Contrastingly, glabrous skin, which is usually found on the human fingertips and lips, does not have this type of fine, soft hair. Glabrous skin is typically denser in touch receptors and more sensitive compared to skin with vellus hair. Its thickness is also different, approximating 4 to 5 mm versus the 2 to 3 mm thickness of skin covered with vellus hair.
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