The air that we breathe is a mixture of different _____ .
When we inhale, we take air into our lungs. what do we breathe out during exhalation? options A :carbon dioxide option B: Nitrogen option C:Oxygen option
D: a mixture of gases that has more carbon dioxide than inhaled air optionE: a and c
Among the different components of air that we breathe in, which gas is most useful to us?