Two types of cells found in the epidermis of the skin and their function

The melanocytes: these produce melanin, the pigment that provides the skin with its color and protects it from the sun's rays.

The keratinocytes: these form epidermal keratin.

Explanation:

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.