>Natural selection is a constant force, presumably new genetic codes could offer an advantage, e.g., robustness against damaging mutation, resulting in multiple

>Natural selection is a constant force, presumably new genetic codes could offer an advantage, e.g., robustness against damaging mutation, resulting in multiple competing genetic codes. But what would the advantage look like? Isn't successfully surviving and propagating for billions of years, the ultimate advantage? It would seem like our current state is the best one then..