Question: If no one on PK's planet communicated using voices, then why did he have vocal cords in the first place?
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Chosen answer: This would be a complex speculation question. But first off, it's not the vocal chords that allow humans to speak as we do, other animals have vocal chords, yet can't speak. It's about our mouths and muscle structure that allows us to "shape" sounds into words. Given the humanoid figure of PK (i.e. small, non protruding mouth and neck length), we can assume PK's species developed the ability to speak and then evolved past that, but maintained the needed structure for speaking for whatever reason, such as eating.
Bishop73