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...
Examples of bacteria pathogenic for a human are:§ Staphylococcus aureus, causing skin infections, pneumonia, infection of the heart valves, etc.§ Streptococcus pyogenes, causing "strep throat",...