STEPWISE ARGUMENT. "Thus, unicellular eukaryotes that, regardless of the exact dating, evolved more than a billion years after the prokaryotes, obviously attained a new level of complexity, and multicellular eukaryotic forms, appearing even later, by far exceeded the complexity of the unicellular ones. Arguably, the most compelling is the argument from the origin of cellular life itself: before the first cells emerged, there must have been some much simpler (pre)biological replicating entities." http://onlinelibrary.wiley.com/doi/10.1002/bies.201300037/full View in LinkedIn