Which of the following is a function of the respiratory system? A. Inhaling and exhaling
B. Moving oxygen into the blood
C. Moving carbon dioxide out of body tissues
D. All of the above

I believe that it is all of the above

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.