Why couldn't we live without atmospheric pressure?

Of course not.

Explanation:

First, you would choke because there's no air to breathe. ... When your skin was stretched to the max, it would burst like a balloon, and all the water inside your body (blood is mostly water) would come boiling out because there is no air pressure, but space is so cold that it would instantly freeze.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.