Organisms can be classified into 3 groups based on the number of their cells. These are unicellular, colonial, and multicellular organisms.
One-celled or unicellular organisms are single-celled which means they only have one cell. Paramecium and amoeba are unicellular.
Multicellular organisms possess many cells.They are the most complex organism. Humans (homo sapiens) are multicellular.
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