What harms the respiratory and circulatory systems?
Cars oxygen smoking vehicles emissions gasoline fresh air lungs
A B C D E F G H
Smoking is a form of air pollution.
smoking harms the respiratory and circulatory systems
What harms the respiratory and circulatory systems? (A) Cars (B) oxygen (C) smoking (D) vehicles (E) emissions (F) gasoline (G) fresh air (H) lungs