How does the earth's atmosphere affect the planet?

Hint: The atmosphere of earth is a blanket of air which is a mixture of several gases and particulate matter which maintains the pressure on earth essential for humans to survive. The greenhouse gases are responsible for maintaining a comfy temperature on the surface of the earth to help life on earth surviving.

Complete step by step answer:
The fact that the atmosphere exists means that the Earth has air pressure (otherwise the planet would be in a vacuum) our body fluids exert pressure internally on our body and the atmosphere exerts pressure from outside on our body these two pressures cancel out each other and our body fluids don`t come out. In higher altitudes where atmospheric pressure is low blood starts to come out from ears and nose and also have the gases necessary for life to exist on Earth (oxygen and carbon dioxide).
Weather occurs in the atmosphere, The water vapors gets accumulated in the atmosphere and condense to come down as rain if the atmosphere hasn’t been there then the vapors would not be getting any place to condense and the water cycle would have been there so every way that weather impacts the Earth is how the atmosphere affects the planet.
At last, the ozone layer absorbs harmful Ultraviolet radiation from the sun.

Note:
The atmosphere does not prevent gases from escaping to outer space. The atmosphere is the gases, and gravity is what keeps them from escaping to outer space. Also, except for Ultraviolet radiation, which is blocked by the ozone layer, the magnetosphere protects our earth from the most harmful solar radiation.