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.
Because it teaches their children wrong from right
That's so easy! It's HIV! HIV is pretty much like AIDS which is a virus. It's the stage before you get AIDS and you're guaranteed to die.
Hope this helps!
Answer:
i believe that the answer is false
Explanation:
