Scraping oneself on a contaminated object may cause infection.
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 a contaminated object may cause an invasion of the body by what?
a. amoebae
b. bacteria
c. blood
d. dogs
e. disease
f. horses
g. toxins
h. fish