Plz answer this ASAP

heymate !

Explanation:

The air pressure is higher at sea level and lower at higher altitudes ( top of the mountain ) .

This is because as we go higher and higher the air in the surroundings become thinner and thinner. And this does not suit you as your blood pressure at high altitudes are comparatively higher compared to the pressure around you at the top of the mountains .

And that is why some of us face breathing issues or nose bleeding due to the imbalance in the atmosphere .

And as we go lower below the sea level the pressure of air around us increases.

And that is why swimmers were tough suits while going down below the sea level, so that their bodies don't get crushed under the extreme pressure on the bottom of the sea .

There are also chances of the skull to get crushed if we don't were the suit while we are under he sea .

hope it would help !

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

i'm pretty sure its b i might be wrong though!