If the question is whether or not individuals or groups most well suited for the circumstances upon which their survival depends tend to propagate over wide thresholds of time, I would say yes. However, within the context of a world where the lifestyles and demands change so rapidly that your environment you grew up in will be vastly different ten, twenty years down the road, I think it begins to dwindle in significance. Adaptability, intelligence, force, or chance, it's a toss up in this era.
ETA: I guessed two of the people who voted no evolution. WIN!!!!