The necessary gases are regulated and maintained by the atmosphere.
The atmosphere regulates the temperature of the earth and controls heat released by the sun from reaching the earth.
The atmosphere regulates the water and mineral cycle.
The atmosphere controls the sun’s harmful UV rays through the ozone layer from reaching the earth.
It protects the earth from small meteors.
The senses of smell, taste, sound, and combustion is only possible by the atmosphere.
Overall, the atmosphere regulates the surrounding of the living being for proper growth and development; without atmosphere, life is not possible on the earth.