WIP Species guide & politics

Venterrans are a nomadic race of aliens resembling humans.
Despite bearing external similarities to Humans, they're internal anatomy is vastly different.
They primarily survive in oxygen based atmosphere, but can survive with little oxygen provided there is Carbon Dioxide in the atmosphere.
This is due to the fact that they possess the ability to photosynthesize nutrients and are able to organically resupply their oxygen. In spite of this trait they still possess the digestive system of an omnivore suggesting that this trait may have been introduced artificially.
They also possess multiple hearts and have a stronger bone density than earthlings due to their prolonged exposure to intense gravitational forces from the seed ship. Their former home world, Terramin, possessed 10x the gravity of Earth.