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This gases makes up close to one-fourth of the air surrounding earth

Sagot :

I think it's oxygen.
It's the Oxygen about 21 % close to one- fourth of the air surrounding air.

about 78 % close to four- fifths are nitrogen gas (Nitrogen) and small amount about 1% of air composition  are other gases and molecules such as
Carbon dioxide, Helium, Neon, Hydrogen, Methane and others