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Except for the Energy Beings, most seem to be hydrocarbon life forms, but methane breathers who thrive at -200 C will sometimes turn up.What they all have in common is that they are Really Alien.They have the same secondary sex traits - as species-specific as you can get.Only their males have much facial hair, and their females often have bodacious figures. This leads to some speculation that they may be of Earth Human descent.Etymologically, and in mainstream English the word means "feeling" but is rare and now archaic.[From Poul Anderson's `Polesotechnic League' stories, going back at least to 1963]An evolved biological intelligence.Implies human-level cognitive and linguistic ability but not necessarily tool use.
For that matter, is it always easy to tell whether a man is merely unconscious or quite dead?However, Aliens with Forehead Ridges continue to thrive in Hollywood Scifi. In casual encounters with the material universe, we rarely feel any difficulty here, since we usually deal with things that are clearly alive, such as a dog or a rattlesnake; or with things that are clearly nonalive, such as a brick or a typewriter.This is for an obvious reason: the audience wants aliens of One of the first ways in which we learn to classify objects is into two groups: 1. Nevertheless, the task of defining "life" is both difficult and subtle; something that at once becomes evident if we stop to think. The caterpillar is alive, but the rock is not; as you guess at once, since the caterpillar is moving and the rock is not.More specific and etymologically correct than sentient.