This page is an archive of a community-wide discussion. This page is no longer live. Further comments or questions on this topic should be made in a new Knowledge Bank page rather than here so that this page is preserved as a historic record. jSarek 11:30, February 9, 2012 (UTC)
Is there an in-universe reason for why all species seem to have generally the same body structure (I'm talking about arms, legs, torso, head, all arranged the same way)? Perhaps a better way to say it is that they all seem to have similar physiologies.
I mean, what are the chances that so many alien races, each developing independently on different planets, happened to come to generally the same form? Even the faces of different aliens seem to share the same layout, with eyes, nose, mouth, etc. —Unsigned comment by184.108.40.206 (talk • contribs).
It's incredibly cheaper to put makeup on an actor then to create a robotic or CGI character. But as for in-universe, there is a theory that the humanoid body plan (biped, 2 arms, opposable thumbs, one brain protected by a skull, all the main sensory organs together at the front, etc.) is the most efficient body plan, and that nature tends toward it. But otherwise, I don't think there is an official reason. But would you want there to be? That episode of Star Trek: The Next Generation when they learned that an ancient humanoid race seeded all the planets with their DNA, hoping that they'd evolve into life similar to it, was really bad. Taral, Dark Lord of the Sith-Just shy, not antisocial: You can talk to me!- 17:48, July 6, 2011 (UTC)
Considering there are so many planets in-universe with type 1 atmospheres, it's not terribly surprising that bipedal sentients with thumbs and apposing fore fingers from said planets, participate within pockets of the galaxy where the galactic community can interact with and accommodate them and vice versa, being of a similar kind and commonality. Perhaps there are other types of life forms that congregate in other types of atmospheres that type 1 sentients find completely inhospitable, or ill-accommodating their physiology as largely bipedal sentient beings who breath oxygen and consist of a majority of water.40 Year Old Virgin 12:46, July 9, 2011 (UTC)