write just a few sentences for an imaginary situation if any one of the following gases disappear from the atmosphere

a)oxygen b)nitrogen c)carbon dioxide

• If no oxygen in atmosphere, all life would have been extinct.
• If no nitrogen in atmosphere, all biogeographic cycle would be extinct and breathing pure oxygen without the mix of nitrogen would kill humans.
• If no carbon di oxide in atmosphere, all plants would die and the planet become colder than ever.

Overall, if anyone of the gas gets disappeared from the earth, that is the end of all life!!