28. Vitiated Air means : A) Air with more amount of O2
C) Air with less amount of CO2
B) Air without oxygen
D) All the above​

Air without Oxygen.

This is air with a mixture of gases hence less oxygen

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

i don't know. if i were you, i would search it up online : d