Here are some other examples:

* Amoeba: A single-celled organism that moves and eats using pseudopodia (temporary extensions of its cytoplasm).

* Paramecium: A single-celled organism covered in cilia (hair-like structures) that help it move.

* Yeast: A single-celled fungus that is used in brewing and baking.

* Algae: A diverse group of single-celled organisms that can be found in water.

All of these organisms are complete living entities despite being made up of only one cell. They carry out all the essential functions of life within that single cell.