What is air? what is the meaning of blood? what is the meaning of skin? what is food for?

Air is a mixture of gases
78% nitrogen, 21% oxygen and 1% other gases

Blood value:
Immunity
Maintains a constant body temperature
Gas exchange between the cells of the body and the environment that surrounds us
The relationship of organs
Blood carries nutrients throughout the body

Skin value:
Removes toxins
Protects organs from damage
Heat and cold protection
In fact, it also creates immunity. does not allow different microbes to pass through itself
It also serves as a body temperature distributor. When you sweat, the skin cools the body in this way

Food value:
Getting energy (for action, providing warmth, body growth)