Occurrence
Multicellularity has evolved independently at least 25 times in eukaryotes, and also in some prokaryotes, like cyanobacteria, See more

One hypothesis for the origin of multicellularity is that a group of function-specific cells aggregated into a slug-like mass called a grex, which moved as a multicellular unit. This is essentially what See more

It is impossible to know what happened when single cells evolved into multicellular organisms hundreds of millions of years … See more

Multicellularity allows an organism to exceed the size limits normally imposed by diffusion: single cells with increased size have a decreased surface-to-volume ratio and have difficulty absorbing sufficient nutrients and transporting them throughout the cell. … See more

During the evolutionary transition from unicellular organisms to multicellular organisms, the expression of genes associated with reproduction and survival likely changed. In the unicellular state, genes associated with reproduction and survival are … See more

• Bacterial colony
• Embryogenesis
• Organogenesis
• Unicellular organism See more

• Tree of Life Eukaryotes. Archived 2012-01-29 at the Wayback Machine. See more