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multicellular organism
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The nematode Ascaris lumbricoides is a multicellular organism.
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The nematode Ascaris lumbricoides is a multicellular organism.
The nematode Ascaris lumbricoides is a multicellular organism.

multicellular organism

life-form
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living things

multicellular organism, an organism composed of many cells, which are to varying degrees integrated and independent. The development of multicellular organisms is accompanied by cellular specialization and division of labour; cells become efficient in one process and are dependent upon other cells for the necessities of life.

Specialization in single-celled organisms exists at the subcellular level; i.e., the basic functions that are divided among the cells, tissues, and organs of the multicellular organism are collected within one cell. Unicellular organisms are sometimes grouped together and classified as the kingdom Protista. See protist.

The Editors of Encyclopaedia Britannica This article was most recently revised and updated by Adam Augustyn.