What is an infection? A. when the DNA of the body's cells is
damaged
B. when the DNA of prokaryotes in the body is
damaged
C. when the body's cells grow in an uncontrolled fashion
D. when harmful foreign microorganisms are
present and multiply in the body

D

Explanation:

An infection is when something invades your body, therefore, you are infected with micro-organisms making it D.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

this is a good question! i'll do some research and come back when i have the answer!