During treatment of water to make it potable, about 90% of the microbes are removed A. by preliminary fermentation. B. in the sedimentation step. C. by treatment with alum. D. by treatment with chlorine or ozone. E. in the filtration step.

Hiv can be transmitted through oral sex. you can get hiv through vaginal fluid and semen. if you have an open sore or cut in or near your mouth and an you get the semen or vaginal fluid of an infected person in those cuts or sores, you can get hiv

What are the options or things that were supposed to match