facial features and black spots are related to what biological process?

Answer: Melanin production

Melanin is a pigment that gives skin and hair its color. It is produced by cells called melanocytes in the skin. Melanin production is regulated by a number of factors, including genetics, hormones, and environmental factors.

Black spots on the skin are often caused by melanin-producing cells that have been damaged or killed. This can be due to exposure to ultraviolet (UV) radiation, chemicals, or other injuries.

The biological process that is related to facial features and black spots is melanin production.