What are the two most common gases in the atmosphere?

The most important gases in the atmosphere are nitrogen and oxygen, the others are considered as atmospheric pollutants. 1. Nitrogen: constitutes 78% of the volume of the air. It is made up of molecules that have two nitrogen atoms, so that their formula is N2. 2. Oxygen: represents 21% of the volume of the air. It is formed by molecules of two oxygen atoms and its formula is O2. It is a very reactive gas and most living beings need it to breathe.  3. Other gases: the most abundant is argon (Ar), which contributes 0.9% to the volume of air. It is a noble gas that does not react with any substance.  4. Carbon dioxide: is made up of molecules of a carbon atom and two oxygen atoms, so  its formula is CO2. It represents 0.04% of the air volume.

what terms are there?

hello

question:

when would a new household be started?

a.when the oldest male died

b.when a man and a woman married

c.when the house could not hold everyone

d.when a child was born

answer: us d when a child was born

hope this have a great day and brainlest