39. Our skin, when exposed to excess sunlight, becomes dark. This is because of our skin pigments called A.flavoxanthin B.melanin C.carotene D.Xanthophyll
Answer: Option B Solution: Within the skin's epidermal (outer) layer are cells that contain the pigment melanin. Suntanning occurs because exposure to sunlight causes the skin to produce more melanin and to darken. The tan fades as these cells move toward the surface and are sloughed off.
