What can cause respiratory issues?
smoking tobacco a pathogens Microscopic organisms Normal humidity some viruses Clean air smoking pipes Mild weather
A B C D E F G H
Mold spores, for example, are microscopic.
Microscopic organisms can have a negative impact on the respiratory system.
What can cause respiratory issues? (A) smoking tobacco (B) a pathogens (C) Microscopic organisms (D) Normal humidity (E) some viruses (F) Clean air (G) smoking pipes (H) Mild weather