text: I think that an advanced biotechnology might be able to copy the human model, but it would be a lot more complicated to genetically engineer and produce not only the humans but all the rest of the living organisms on earth.\n\nThink of it: if you wanted to colonize a planet, would you engineer a species like ours, or would you make adaptations to your own species?\n\nTerry Pratchett's novel "Strata" tells of world builders who create entire planets complete with faked pre-history. And spoofs the idea...