Board Thread:General Discussion/@comment-32147440-20171202005054/@comment-24922135-20171218200632

Because DNA is a specific chemical. The simple facts of most aliens means they cannot have DNA. Heatblast, NRG, and Atomix would destroy their own DNA due to heat and (in the case of the latter two) radiation. Echo Echo is living sound (apparently) so he has no room for physical DNA. Overflow is living water in a mechanical suit (according to some unreliable sources). Clockwork is made of bronze/brass metal. AmpFibian can turn into electricity, which would destroy any DNA in the process. Same with Buzzshock. And Gravattack is a living planet. If being made of rock wasn't enough to prove he doesn't have DNA, his molten core would have destroyed it if he had any.