Select from the following. a). disease-causing microorganisms b). air c). water d). wind and erosion e). food f). smallest agents of disease g). exposure to cold h). influenza orthomyxoviruses

Fact 1: Disease-causing microbes have a negative impact on the body. Fact 2: Microbes are also called microorganisms. Given the two facts above, what has a negative impact on the body?
Answer:
a).