what does a breathing mask keep harmful particles from entering?
skin tissue stomach h2o H20 air lungs gas masks
A B C D E F G H
Pulmonologists treat lungs and respiratory systems.
a breathing mask is used for keeping harmful particles from entering the lungs
what does a breathing mask keep harmful particles from entering? (A) skin (B) tissue (C) stomach (D) h2o (E) H20 (F) air (G) lungs (H) gas masks