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.
lamellae....................................
Abstinence is a good idea for teenagers because often very young people
are not prepared for the realities and risks that come with sexual
intercourse. These include pregnancy, sexually transmitted infections
and diseases, and the emotional impact that sex has upon them as
individuals.
Chronic liver disease matches cirrhosis.