Well, without it, we couldn’t breathe. You don’t suck in air so much as you use your diaphragm to lower the pressure inside your chest, and atmospheric pressure fills the gap. Also, we couldn’t see. The moisture on your eyeballs only stays in liquid form bc of air pressure. It would boil away at a low temp without air pressure, as pressure has direct correlation to melting points/ vapor points etc. Same for the liquid IN your body. Without pressure pushing on you, you begin to expand. And the same thing that happens to your eyeballs can happen to the 70% of your chemical makeup that’s water.
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