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Because sound cannot travel through vacuum. It needs a medium. While the electromagnetic waves can travel through vacuum e.g sun light. 
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It is not how it travels, it is the basic concept behind it being called a mechanical wave
But my answer is also not wrong.
Did I tell that ur answer is wrong?????
Why have you written "no"???
By mistake, sorry
Sound is called a mechanical wavw because sound needs a medium to travel. it cannot travel thriugh vaccum
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