When you say "evolution" happens do you mean any more than that one can walk differently into than out of AMNH? This is a serious qestion becasue the flow between Buffalo and NYC can often mask for the failure to comprehend that Croizat had dismantled the reference valdation that currently dominates in evolututionary theory.
With only Croizat's foot notes to work from then, it far from clear to me just how much beyond path analysis evolution occurs causally. The correlation is not causation.