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Suggested reading includes The Encyclopedia of Science Fiction's entry on "Aliens", Steve Colgan's Worlds of Possibility blog, Life Everywhere by David Darling, The Science of Aliens by Clifford Pickover and Aliens and Alien Societies by Stanley Schmidt.[first use unknown, but goes back at least to 1940s]General SF term for an extraterrestrial or alien possessing human-level intelligence (see sophont).
Is it easy to tell a live seed from a dead seed, or either from a grain of sand?
For that matter, is it always easy to tell whether a man is merely unconscious or quite dead?
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.