To what part of skin would you compare a lubricant for a car the tiles on a roof a thermometer an air conditioner and paint?

A lubricant for a car can be compared to the skin's oil, which reduces friction and keeps components functioning smoothly. Tiles on a roof are akin to the skin's outer layer, providing protection against environmental elements. A thermometer resembles the skin's sensory receptors, which detect temperature changes. An air conditioner acts like the skin's sweat glands, regulating temperature and maintaining comfort, while paint serves as a protective barrier, similar to how skin shields the body from external threats.