Answer: I think its either C.) or B.)
Explanation:
<span>Exposure to cigarette smoke mostly is the case</span>
The answer would be : <span>systemic antibacterial therapy.
Hope this helps !
Photon</span>
I am not 100% sure but i have an idea for the first box, In the circulatory system, blood is pumped into veins that carry the blood to tissues in your body. I really hope this helped you and was correct.
