However, here are 3 examples from different categories to give you a broad idea:
1. Bacteria: A common example is Escherichia coli (E. coli). Found in the gut, some strains are helpful, while others can cause food poisoning.
2. Virus: One famous example is the influenza virus, responsible for the flu. Viruses are much smaller than bacteria and require a host cell to reproduce.
3. Fungi: Yeast is a type of fungus used in baking and brewing. There are also many other types of fungi, some beneficial and some harmful.
To learn more, you can research specific types of microorganisms, like:
* Protists (like amoebas)
* Archaea (single-celled organisms often found in extreme environments)
* Parasites (organisms that live in or on another organism and benefit at the host's expense)
