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An organism is classified as unicellular when it is composed of only one cell. the cell itself does not differentiate. it can only reproduce via mitosis. The organism does not have organ systems. Examples of these organisms are amoeba, bacteria, stentor, paramecium, euglena, and most protists.

An organism is classified as multicellular when it is composed of many cells. Each cell differentiates into a specialized cell. The organism has organ systems. Examples of these organisms are animals, plants, some protists, algae, and fungi.

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10y ago

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