* Bacteria: These are single-celled organisms that are incredibly diverse and found everywhere on Earth.
* Archaea: Similar to bacteria, these are single-celled organisms that often live in extreme environments.
* Protozoa: This is a diverse group of single-celled organisms that can be found in water and soil. Examples include amoebas and paramecia.
* Yeast: A type of fungus that is single-celled and often used in baking and brewing.
* Algae: While some algae are multicellular, many are single-celled, like diatoms and phytoplankton.
Let me know if you want to learn more about any of these!
