Scraping oneself on an object that is what, may cause an invasion of the body by bacteria?
unknown safe threatened harmful substances Pollution foreign barrel-shaped contaminated
A B C D E F G H
An infection is an invasion of the body by bacteria.
Scraping oneself on a contaminated object may cause an invasion of the body by bacteria.
Scraping oneself on an object that is what, may cause an invasion of the body by bacteria? (A) unknown (B) safe (C) threatened (D) harmful substances (E) Pollution (F) foreign (G) barrel-shaped (H) contaminated