Question

This essential gas is important so that we can breath. ...​

Answer 1

Answer:

Although we can't see it, the air we breathe is made up of several gases. Oxygen is the most important for keeping us alive because body cells need it for energy and growth. ... Carbon dioxide is the waste gas that is produced when carbon is combined with oxygen as part of the body's energy-making processes.

Answer 2

Answer:

$oxygen \: ({o}^{2} ) \: is \: your \: answer$