| Interesting theory, I'm not sure if the alien "face-huggers" were a specific design to fit humans though. There is no other sign of alien life in the Alien universe, but a face-hugger is able to attach itself to a dog and grow from there (Alien3). Presumably when AvP comes out, we will see face-huggers attacking Predators. I know all creatures on Earth share a very similar DNA structure, and as the Predators look similar to a humanoid, presumably there isn't too much variation there either..?
It would seem to be that the face-hugger is able to attach itself to any living creature that has a respiratory system similar to a human, i.e. breathing some form of air, so vulnerable to being choked if the anyone attempts to remove the creature. The acid blood is another deterrent here, as it would kill the victim.
These seem to me to be very biological traits, leading me to the conclusion that the Aliens are a biological species.
As to whether they were engineered or are a product of evolution, that is something we may never find a satisfactory answer to. As you say in your original post, if they are an evolved species, then they must have evolved this way in response to something. Perhaps the Predators (in the movie sense, rather than the generic one) are the threat that the Aliens evolved to fight? AvP *should* go some way to answering that question...
There is though a compelling argument that they are engineered, given the metallic components, and their amazing adaptability and ability to survive for hundreds, perhaps thousands of years in egg form. The Queen Alien seen in "Aliens" could be thought of as either the pinnacle of the species evolutionary process (ignoring the hybrid from Resurrection for now), or as a masterpiece of genetic engineering. Again, there is no right or wrong, nor any way to prove it either way.. |