Multicellular

Multicellular organisms are organisms that consist of more than one cell, in contrast to unicellular organisms. All species of animals, land plants and most fungi are multicellular, as are many algae.

Characteristics

Multicellular organisms have a variety of specialized cells that perform specific functions, because they are composed of more than one cell. They have cells that cluster together to form tissues, which in turn cluster together to form organs. These organs work together to function as an organ system.

Evolution

The evolution of multicellularity occurred in multiple independent events, in organisms as diverse as sponges, brown algae, cyanobacteria, slime moulds and myxobacteria. In these groups, cells began to work together, and the resulting cooperation allowed for the development of multicellularity.

See also

• Cell
• Cell division
• Cellular differentiation
• Organism

Multicellular Resources
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