Question

list the two most important atmospheric gases and their relative composition

Answer 1

Oxygen and Carbon dioxide are important gases in atmosphere because of their life supporting properties .

Answer 2

Carbon dioxide (CO2) andoxygen (O2) are the most important gases for living organisms. CO2 is vital for use by plants in photosynthesis, in which plants use CO2 and water to convert the Sun's energy into food energy.
Oxygen — 21 percent
Carbon dioxide — 0.04 percent.