Which part of the skin contains capillaries, lymph vessels, and nerve endings?

The dermis is the correct answer because it is the layer of skin that contains essential structures such as capillaries, lymph vessels, and nerve endings. This layer lies beneath the epidermis (the outermost skin layer) and above the hypodermis (which primarily consists of fat and connective tissue).

The dermis is responsible for providing the skin with strength, elasticity, and support, thanks to its dense network of collagen and elastin fibers. The capillaries found in the dermis play a crucial role in supplying blood to the skin and regulating temperature. The nerve endings in the dermis are vital for the sensation of touch, pain, and temperature, contributing to the skin's functionality in interacting with the environment.

In contrast, the epidermis does not contain blood vessels or extensive nerve endings; instead, it serves as a protective barrier. The hypodermis mainly contains adipose tissue and connective tissue and is not primarily responsible for sensation or vascular functions. The stratum corneum is actually the outermost layer of the epidermis, composed of dead skin cells, and does not house any of the structures mentioned in the question.