[decimon]

Oxides in their food sources, used by a special breakdown process?

Dunno. It says that they live their entire lives without oxygen but I don't know if that's to be taken literally.

[djf]

Can’t be literal.

Unless they have no DNA and are like those rock things on Star Trek.

De-OXY-ribonucleic acid.

So they must mean they actually have oxygen in them, but for them it’s more like a mineral. Like calcium is for us.

But their respiration is based on H2S.