List the functions of the skin.

The skin is the most extensive organ, which is the cover of the body of a living being. Derivatives of the skin include nails (claws), hair (wool, feathers), scales.
The skin performs many functions in the body of a living being. These features include:
– respiratory, which carries out the process of gas exchange;
– protective, which protects the body from external influences;
– thermoregulatory, regulating body temperature;
– immune, which develops the body’s immune response;
– receptor, carried out due to the spread of nerve endings over the entire area of ​​the skin.