Conversation so far:
what are three functions of the skin or integument
The skin and accessory structures perform a variety of essential functions, such as protecting the body from invasion by microorganisms; preventing dehydration; acting as a sensory organ.
what else does the skin do
The skin and accessory structures perform a variety of essential functions, such as modulating body temperature and electrolyte balance; and synthesizing vitamin D.
any other functions of the skin
The underlying hypodermis has important roles in storing fats, forming a “cushion” over underlying structures, and providing insulation from cold temperatures.

Question: how does it protect people
Self-contained rewrite: how does the skin protect people