Board Thread:Questions and Answers/@comment-25069771-20140616130529/@comment-25069771-20140618094815

The lower gravity might explain that Kryptonian life forms are stronger, but that doesn't explain any of the rest. There is no reason why a different solar spectrum would cause a lifeform to gain powers. Why would evolution produce an organism that benefits in an environment it never encountered? Even assuming that it was possible to evolve a way to gain superpowers that depended on the yellow sun, why would that evolve light years away from one? The fact that this capacity is present in multiple species simply demonstrates that they provided the prison with lifeforms from the Kryptonians home planet.

Yes the Kryptonite mysteriously transformed into something that hurts Kryptonian organisms - and nothing else. There is no record of any non-Kryptonian being adversely affected by Kryptonite, with the possible exception of Lex Luthor, who carried around Kryptonite for YEARS before it possibly caused cancer. This makes sense if the planet was DESIGNED to transform into poison to finish off any escaping Kryptonians.

We aren't stronger in other environments are we? If we were sent to Venus we wouldn't have superpowers. When you take a camel out of the desert and put it in a rainforest, it's doesn't get stronger. When you take a shark out of the water it doesn't suddenly get move faster.