Otimalidade em Biologia?

Excelente artigo de Robert Dorit na American Scientist: "The typewriter keyboard is clearly the product of human ingenuity and is part of a technological revolution that continues to transform our lives. The genetic code, in contrast, resides at the very core of every living organism and has been evolving for four billion years. Yet both the keyboard and the code help illustrate the ways in which the persistence of features may not in itself be proof of their superiority. Instead, persistence may simply reflect the tenacious grip of a functional solution that emerges early in the process. In other words, a feature does not have to be flawless to endure—it just has to be good enough".