Homo sapiens

Humans are a DNA-based sophont species originating from Earth in the Solar system. The scientific designation for the human species is Homo sapiens. More than any of the other great apes, humans are highly-intelligent and highly-social bipeds. Over time, particularly during the 23rd century, humans were artificially genetically modified and enhanced. This has led parts of the scientific community to refer to modern humans as Homo sapiens melius or Homo optimus. 
Though they originate from Earth, humans began migrating away from it in the 2100s and especially from the 2220s onwards. They now populate a majority of inhabited systems in the Galaxy. In the 28th century, the overwhelming majority of humans live in the Terran Federal Republic and are the leading species of the nation. With over 72 billion humans alive today, they are the most numerous single species in the Galaxy.