The world of 'twin carbons' and its six skeletal planetary counterparts are defined by mutually opposing 'twin moons'—or, more precisely, by the opposing currents of water associated with these twin moons.
When dark matter is brought into the sky above the carbon-based surface of the 'twin Earth,' it interacts with the 'DC carbon' present on the opposite side.
All "twin species" exist within "twin worlds." Furthermore, all such species are encompassed by the framework of The Black Hole-related twin planetary existence—comprising both "existence space" and "anti-existence space" (or "dark matter twin" space).