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No. It's not vestigial.

"The xiphoid process anchors several important muscles, including the abdominal diaphragm, a sheet-like muscle that is necessary for normal breathing. It also anchors the rectus abdominus muscle (the "abs," responsible for the bodybuilder's "sixpack") and the transversus thoracis muscle, located just inside the front of the ribs."

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11y ago

What else can I help you with?