How much oxygen, nitrogen and carbon di oxide (CO2) is there in earth atmosphere in terms of percentage?

Question

If there is no atmosphere, then the duration of daylight on earth will
(a) Increase
(b) decrease
(c) remain same

Answer 1

Atmosphere of the earth has many gases but the above mentioned are the main ones.
If we measure by volume then Atmospheric air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.