In many works of Sci-Fi, whether by budget limitations or laziness, many alien species tend to resemble humanity in form. It is no different i this world. Here, only a few can claim to have a common ancestry. Common ancestry is normal through space faring races who developed a divergent evolution or different biological traits. Others migrated through magical portals or with the aide of gods. Normally this bizarre phenomenon is due to convergent evolution and has become the accepted reasoning out to non space faring humanoids. Most races under this category normally have evidence to prove their origin or have an educated guess. This does not stop conspiracy theorists to delude themselves with "ancient aliens" even if it seems likely. Most space age 'human' races consider ancient aliens as quackery at a very low best and at worse a sign of poor mental health. If one wishes to prove an ancient aliens theory one must obtain the documents of space faring and other related activities with the proof that there was a portal in the area while disproving fossil records and historical accounts dating back centuries or millennia. Biologically, these species are similar enough to reproduce regardless of the genetic deviation range. The range goes from biologically Earth Human to quirks like extra organs or a strange color of skin to something akin to Krytonians (This would be stretching it to this group).