Final answer:
The dermis of the skin is made up of dense irregular connective tissue, which consists of collagenous fibers that provide strength and flexibility.
Step-by-step explanation:
The type of tissue that makes up the dermis of the skin is dense irregular connective tissue. This type of tissue consists of collagenous fibers that are interwoven into a mesh-like network, providing strength and flexibility to the skin. The dermis also contains other components such as blood vessels, nerves, and sweat glands.