Why do most nation repugnance screech sounds?

Finger nails down a chalk board...seem like everybody hate it. My question though is WHY? What something like that noise seem to bother us so much? ...


Answers:    It probably goes fund to when we were apes and the nouns of an attack would've been screech apes. Alternatively it might be linked to the nouns of babies crying and some sub-conscious trigger to action to try and stop the crying.
the stimuli within yourears can't stand it

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