Question

Help? ??? ? ?? ? ? ? .Which of the following is the most likely way for bacteria and viruses to enter a water supply?

Increased photosynthesis releases bacteria and viruses

Poor sanitation habits cause water to mix with sewage

Water from a burst dam sweeps particulate matter into a nearby river

Chemical fertilizers dumped into the water attract bacteria and viruses

Answer 1

B) Poor sanitation habits cause water to mix with sewage. Sewage are domestic wastes from home, which contain organic materials. These organic wastes attract pathogens including bacterial and virus, which feed on these wastes and decompose them. Poor sanitation habits will make one to dump these waste in water supply, especially in a place where there is weak environmental protection laws.

Answer 2

Thanks (:

Answer 3

Photosynthesis creates sugar out of gas, water, and sunlight, so that's not right.
How often do dams burst to make this seem like a likely answer, really?
Chemical fertilizers probably contain pesticides that kill bacteria rather than attract them.