Which of the following is most likely way for bacteria and viruses to enter a water supply? a).increased photosynthesis releases bacteria and viruses b).poor sanitation habits cause water to mix with sewage c).water from a burst sweeps particulate matter into a nearby river d).chemical fertilizers dumped into the water attract bacteria and viruses

Id say its B, it makes more sence as most bacterial contamination is brought on by poor sanitation or hygiene.  

Ifound this on google “here are some features of the alveoli that allow this: they give the lungs a really big surface area. they have moist, thin walls (just one cell thick) they have a lot of tiny blood vessels called capillaries.for more information go to the website below › bitesize › guidesi hope this you for what your looking for. can you plz mark me brainliest?