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.
Fun fact: i don’t think any of us asked
A. Warning signs, they can make the person with the illness more ill, they could feel neglected or like no one understand what they are doing and can't see the signs but jn some cases it's the person with the illness that doesn't know like bipolar people might not know they are bipolar until the test.
It can be challenging because you have to learn at there pace when you have your own pace of working
