Microorganisms include a wide variety of bacteria, protozoans, fungi and other organisms that can only be seen with a microscope. based on the text referenced above, what conclusion would you reach about microorganisms? a) bacteria outside the intestine are always harmful to humans. b) bacteria are the only microorganisms that can be both and harmful. c) one general type of bacteria can have various forms that cause different reactions. d) the bacteria in our intestines protect us from other microorganisms that can be found in water.