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.
It's the fourth amendment but i think this question should be in history
Since it’s 2020 and we are going through a pandemic atm you could put someone like: An action I would take to improve their health of my school would be to have classrooms sanitized and bathrooms have refilled soap. This will improve less germs to spread and less people to get sick. Once someone gets sick their immune system is low and they are at higher risk to catch something worse.
(I put for bathrooms to have soap refilled because ik my school sucks at that XD) but you’d am always change how you word it.
A.Musclar Balance Because it helps you with physical health.
C. Methanol is a poisonous liquid alcohol known to cause blindness
