Superman's power is derived from his a molecular reaction to yellow sun.
Superman's powers developed over time as his body absorbed the sun from his childhood to the present.
We know that the original people had dark skin as a result of absorbing the rays from the sun
so why wouldn't Superman's body have done the same thing over the course of his childhood especially
turning his skin dark as a means of absorbing the maximum amount of sunlight. Light or pale skin is an
evolutionary trait resulting from sunlight deficiency which Kal El would not have suffered from.
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