No 2-celled life exists intermediate between one- and multi-celled (Talk.Origins)
There are no two-celled life forms intermediate between unicellular and multicellular life, demonstrating that the intermediate stage is not viable.
- Brown, Walt. 1995. [http://www.creationscience.com/ In the Beginning: Compelling evidence for creation and the flood.0 Phoenix, AZ: Center for Scientific Creation, p. 9.
Since some types of single cell organisms do form colonies, it is agreed this is at best a weak argument. However, the bridge between single cell and multi cellular organisms is more than the number of cells but the fact that different cells take on different functions despite having the same genetic code and actually function as a single entity.