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A particular race of Aliens with Forehead Ridges may all have a culture like that of medieval Japan, or one based entirely on music, but you will very rarely find more than one culture per species.
(The Vulcans and Romulans of Trek fame are a rare exception.)Because of the similarity (or at least comprehensibility) of cultures, Earth Humans can have far more complex and intimate relations with Aliens with Forehead Ridges than with Really Aliens.
This is partly because it is not clear what we would fight them over, and partly because they may have an alarmingly high TECHLEVEL, making war with them a dangerously one-sided proposition. See COSMIC BACKGROUND HISTORY.2) Aliens with Forehead Ridges.
Much more common - especially in HOLLYWOOD SCIFI - than Really Aliens, these are species that look almost exactly like Earth Humans, except for some distinguishing visible feature such as, well, forehead ridges, or odd-shaped ears, or whatever.
Modern medical advances are making it a matter of importance to decide the moment of actual death, and that is not always easy.
In written SF, the KNOWN GALAXY seems increasingly to be inhabited only by Earth Humans.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?Yet what if the caterpillar were crawling over the trunk of a tree?The trunk isn't moving, yet it is as alive as the caterpillar.