Which of the following organism is made up of only one cell?
Euglena
Organisms can be classified as unicellular and multicellular based on the number of cells they contain. Ants, mosquitoes and mosses are multicellular organisms. Mosses belong to the plant kingdom. Euglena is a unicellular organism. It is made up of a single cell that is capable of performing all the life processes required by it to survive.