What is the structure of the skin of vertebrates? What functions do they perform? Illustrate the answer with examples.

The skin of vertebrates is formed by two layers: the skin itself, or the dermis and epidermis. Dermis is well developed in mammals. It is an interweaving of connective tissue fibers.
For aquatic mammals and animals living in cold climates, the dermis plays an important role in protecting the body from hypothermia. The dermis contains the skin glands, blood vessels, receptors, and nerves that fit into them.

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