Answer: An organism that has only one cell is a unicellular organism.

Explanation:

• Based on the number of cells in the body of living things, they can be classified into two categories, namely unicellular and multicellular.

• Unicellular organisms are living things that consist of a single cell. Unicellular organisms can be colonies or live individually. Which includes single-celled organisms, namely amoeba (amoeba), fungi such as yeast, bacteria, some types of protists and cyanobacteria. The characteristics of unicellular organisms are that they have a body shape that cannot be seen by the eye, it can only be seen through a microscope. But sometimes unicellular organisms can also be seen with the naked eye. The number of unicellular organisms is not as much as multicellular organisms which almost include all living things. Unicellular organisms are considered more primitive than multicellular organisms because of their simple systems. The circulatory system of unicellular organisms is carried out by the movement of the cytoplasm of the cell called cyclosis. These single-celled organisms appeared several billion years ago. Which includes single-celled organisms, namely amoeba (amoeba), fungi such as yeast, bacteria, some types of protists and cyanobacteria.

• Multicellular organisms is a biological term for organisms that have many cells whose contents are quite contrasted with unicellular organisms which generally only have one cell. Organisms of this type can usually be seen with the naked eye (except for a few more specific organisms). Examples of multicellular organisms are animals and plants.

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