They are beneficial microorganisms.
Because they produce about half of the oxygen we breathe, and they are at the bottom of the ocean food chain.
helpful microorganisms help our bodies proceed health
They can make you sick, some can kill you and can give you infections.
Microorganisms are the basis of every food chain on the planet. Were it not for them, we would starve. Even if we had food to eat, we would be unable to digest it, because we need the bacteria in our...