The xenomorphs, though vaguely humanoid, don't look like they belong to any known animal clades. The laws of physics apply everywhere in the universe, so the fundamental principles of evolution are likely to apply as well.Įxtraterrestrials that share no ancestry with life on Earth are unlikely to resemble reptiles, birds, insects, or any other familiar groups. The titular creature of the Alien franchise is one of the most iconic movie monsters of all time, but how plausible is it? Any discussion of the appearance and physiology of alien life is inherently speculative, but we can make educated guesses informed by an understanding of evolution and the history of life on Earth.
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