When we breathe in, we inhale the air around us which contains oxygen.
When we breathe in, we inhale many gases, including oxygen. What happens to the gases that the body can't use?
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
What is the percentage of oxygen in the air we inhale?