It’s almost certainly not just one function. An ant’s fitness function is different from its ancestor’s fitness function, which is different from its own ances

It’s almost certainly not just one function. An ant’s fitness function is different from its ancestor’s fitness function, which is different from its own ancestor’s fitness function, which is different from... You don’t get from zero to complexity with a single fitness function. The question we should ask is: How do we vary the fitness function over time in order to evolve something complex? I have no idea what the answer is, but... “If you know the question, you know half.” -Herb Boyer, geneticist