Question

do we breath only one gas at a time if not what amount of gas do we breathe respectively​

Answer 1

Answer:

no

..........

we breathe amount of air which contains mixture of gases

but we only use oxygen for metabolic activities

and get rid of carbon dioxide

Answer 2

Answer:

no we do'not only breath oxygen but a mixture of gases

Explanation:

because there is 74% of nitrogen,21% of oxygen & 1% of other gases