the atmospheric pressure decreases upwards, hence the inter-molecular attraction between the air molecules decreases or to say that the inter-molecular space increases and the parcel of air expands.
Acute stress comes with a lot of adrenalin and for most people living ordinary lives lacks that. -hope this helps have an amazing day!!
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Lungs take in gas from the Atmosphere, where the Oxygen is diffused into the blood cells, which take the Oxygen to different organs/places that need it. . .
Gills take in dissolved oxygen from the water, and then use diffusion like lungs.
