Genetic twins are two or more species that are nearly identical with few genetic differences. Thus far, every species in the known universe has a genetic twin, and in the case of the Moranians, Sarnisians, and Helmecutes, scientists argue they are genetic triplets. Breeding across genetic boundaries is only possible through twin species. For example, a Human cannot procreate with a Zintoniean, but they can procreate with a Tloyd because of their biological similarities.

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