multicellular

mul·ti·cel·lu·lar | \ ˌməl-tē-ˈsel-yə-lər

, -ˌtī- \

Definition of multicellular

: having, made up of, or involving more than one and usually many cells especially of living matter It is probable that with a few exceptions all the cells in a multicellular organism have the same genetic information encoded in the chains of nucleotide bases that make up their DNA.— James E. Darnell, Jr. A biofilm is a community of bacteria that use intercellular signaling to establish complex multicellular structures by coordinating gene expression and phenotypic changes.— J. Christopher Post et al.

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Multicellular organisms are distinguished from the very primitive single-celled organisms—bacteria, algae, amoebas, etc. Even sponges, simple as they are, have specialized cell types such as digestive cells. In complex multicellular organisms, only the surface cells can exchange substances with the external environment, so the organisms have developed transport systems such as the circulatory system, in which the blood brings gases and nutrients to the cells and removes waste products from them.

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