Indeed. Take for example art, music and math, all of which, confer no Darwinian biological advantages. — 3017amen

I think you are under the impression that natural selection is the only mechanism for evolution. It is simply not true that organisms evolve only those traits that provide it biological advantages. Evolution is simply gradual changes that accumulate over time. These changes can be completely random and may not be naturally selected for. Math could also be a consequence of increased reasoning capabilites (which certainly confer an organism biological advantage). Simply because a trait doesnt give an advantage doesnt mean the trait didnt evolve through other mechanisms.