Skin protects us from the harmful UV rays, proffer organs and used for painting in canvas.
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We can use the skin as a test surface before putting potentially noxious chemicals in our body. Please note I heard the following in a survival context not a scientific context so I must warn you not to take as proven fact - but in a situation where the only things to eat are berries, fungi etc that could be highly toxic, the first stage is merely to smell them (if the smell makes you gag or is very unpleasant then discard) the next is to rub a tiny amount onto the skin (to check for irritation)
it is used to protect the organs

it is used to get the moisture
Skin is the soft outer covering of vertebrates. Other animal coverings such as the arthropod exoskeleton have different developmental origin, structure and chemical composition.
That is what is skin not the uses
take light!! too lazy to type
It helps people retain moisture , protect organs and prevent infection