Why are most animal faces eyes at the top, nose in the middle, and mouth at the bottom? How are they all so similar?
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As others point out, it depends on whether you’re in the same branch on the tree of life. As a contrast, consider something like the octopus/squid family. Some are quite intelligent, yet look absolutely nothing like us at all. Any aliens we run into are likely to be as different from us as the octopus.
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