Question

the reddish color of the skin of the lips is primarily due to the presence of which pigment? multiple choice hemoglobin myoglobin keratin melanin carotene

Explanation:

The lips have a rich blood - supply. Hemoglobin in red blood cells gives the lips their reddish color. Myoglobin is mainly in muscle, keratin is a structural protein in skin/hair/nails, melanin gives skin its tan - brown color, and carotene can give a yellow - orange hue.

Answer:

A. Hemoglobin