We need air, food, and water because those things are the things that make us live.
Living things need air , food and water to survive
no some dont need air like fish dont they need water
Sunlight Air Water energy
organs need it
air
All living things need air!
Things need to be airtight so the air wont come out. If It comes out the contraption will noe work.
There will be less things of what we need.
water air food
you need low air pressure and oxygen and.................
because vents bring in things you need like air and bring out things you don't really need like water.