Question

What is the wrong statement " We breathe in oxygen and breathe out carbon dioxide"?

Answer 1

oxygen is the gas required by our body cells to break down glucose to produce energy by the mitochondria which r transported by the RBC's from the lungs to the tissues and co2 is form due to the oxidation of the  glucose and is removed by the rbc's by transporting it from the tissues to the lungs to be exhaled

Answer 2

Actually I am not sure of the answer
But we breathe in various gases which includes $O_2$ and we breathe out all the unnecessary gases which are not needed