Which part of the skin contains capillaries and lymphatic channels?

The dermis is the layer of skin that contains capillaries and lymphatic channels. It lies beneath the epidermis and is rich in blood vessels, providing nourishment to the skin cells and helping regulate temperature. The presence of these capillaries is crucial for delivering oxygen and essential nutrients to the skin, as well as facilitating the removal of waste products. Additionally, the lymphatic channels play an important role in immune function and fluid balance. The other layers mentioned do not possess these features: the epidermis primarily provides a protective barrier and lacks blood vessels; the subcutaneous layer contains fat and connective tissue but is not directly involved in the exchange of nutrients and waste; and the stratum corneum is the outermost part of the epidermis, consisting of dead skin cells and lacking vascular components. Therefore, the dermis is the correct answer due to its anatomical structure and functional importance in the circulatory and lymphatic systems.