Which layer of the skin is composed of connective tissue and provides mechanical support to the epidermis?

The correct answer is the dermis, which is the layer of the skin that consists primarily of connective tissue. This layer plays a significant role in providing mechanical support and strength to the skin. It contains collagen and elastin fibers that contribute to the skin's elasticity and resilience, allowing it to withstand stress and strain.

The dermis also houses blood vessels, lymphatic vessels, nerve endings, hair follicles, and various glands, all of which contribute to the overall functionality and health of the skin. By supporting the epidermis, which is the outermost layer and primarily composed of epithelial cells, the dermis ensures that the skin can effectively protect internal structures while also facilitating sensory perceptions and thermoregulation.

The other layers mentioned, such as the epidermis, are more focused on providing a protective barrier rather than structural support. The hypodermis and subcutis are primarily composed of fatty tissue and play roles in insulation and energy storage rather than the mechanical support that the dermis provides.