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Question:
Why are the gases in the atmosphere important for life?
Answer:
Not only does it contain the oxygen we need to live, but it also protects us from harmful ultraviolet solar radiation. It creates the pressure without which liquid water couldn't exist on our planet's surface. And it warms our planet and keeps temperatures habitable for our living Earth.
Atmospheric gases not only allow for life on Earth as we know it, but also affect the air we breathe (the air quality) and the climate we live in. Some gases like carbon dioxide (CO2) and methane (CH4), affect the absorption of terrestrially produced infrared radiation and are called greenhouse gases.
Earth gas in atmosphere are not dangerous, Without oxygen we can't live. Earth has oxygen, but the gas in other planets doesn't have oxygen because they do not have the gas.
If there is no air means no oxygen. If there were no oxygen molecules in the air, there would be fewer particles for light to emit. All plants and animals need oxygen to carry out various metabolic activities. Without oxygen, we cannot breathe and life on Earth will end.