Fact 1: Disease-causing microbes have a negative impact on the body. Fact 2: Water was tested for the presence of disease-causing microbes. Given the two facts above, water that is not what can have a negative impact on the body?

OPT: 1. salinity 2. chemicals 3. sweat 4. an object 5. tested 6. deadly 7. dangerous 8. dead
Answer:
5.