Fact 1: Disease-causing microbes have a negative impact on the body. Fact 2: Microbes are microscopic, single-celled organisms without a nucleus. Given the two facts above, what has a negative impact on the body?

I. photons;
II. exposure to cold;
III. abundant food;
IV. influenza orthomyxoviruses;
V. disease-causing organisms;
VI. smallest agents of disease;
VII. rocks;
VIII. a tree falling;
The answer is:
V.