Because its air we cant see it thats why its clear because it would be scary if we were able to see air! :)
When a patient is unconscious( without a pulse) CPR should be performed.<span />
Answer: the answer is D. I hope I helped!
Explanation:
I believe it’s carbon dioxide, because you use your respiratory system to breathe in oxygen, and oxygen goes through your circulatory system. And you breathe out CO2.
