Question

what does happen as you climb higher and higher up a mountain

Answer 1

if you climb up higher and higher than the oxygen level will decrease and we will have problem to breathe.
we can also have nose bleeding and can also feel unconscious
thus it is a very difficult task to move higer and higher
hope you like it

Answer 2

with higher altitude...the pressure decreases and oxygen level decreses and hence we get difficulty in breathing...