Help on Health?

does anyone know how resporation is affected by elevated altitude, going ot space, and going under marine.. Help In high altitude, in attendance is less gravity, so smaller quantity force on the air molecules. Therefore, they are farther apart and the upper air is "thinner" so your breathing would be more rapid, all the same less powerful in keeping your blood oxygen level up.
In space, there is a vacuum so necessarily, there is no nouns, since the definition of a vacuum is negative pressure, or pressure i.e. less than atmospheric. So, you would not know how to breathe without an alternative source of nouns.
Under water, the pressure pushed on the body by the wet causes the lungs to "shrink" somewhat, and there is no nouns there. So, you cant breathe underneath water. Also, you enjoy to come up from deep marine slowly because when you dive under the hose down, the nitrogen gas in your lungs is held into the water inside your body, when you come up too nippy, it bubbles (like uncapping a bottle of soda) and it can release bubbles into your blood stream and is potentially fatal.