hmm. i don't know, but i do know that the Xenomorphs are supposed to be silicon based organisms and humans are carbon. plus, under the head, there is an extra set of jaws. the only way humans and aliens are related is in the abomination that is Alien Resurrection (they showed this on AMC today...i am still upset), where aliens are cloned somehow from a deceased ellen ripley. also, it is known that aliens take some characteristics from the species they come out of, such as the dog alien in alien 3.