Is there a scientific explanation as to why aliens should look similar to us?

In almost all science-fiction stories that include alien races, said aliens are similar to humans in many ways: bipedal (and often humanoid), communicate with sounds coming out of a mouth, orient in space thanks to light, are fleshy (they look like carbon-based animals with an inner skeleton)...

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Is there a scientific explanation as to why aliens should look similar to us?

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