They don’t! Males and females have the same. I think this idea comes from the first book of the bible, Genesis, where it is stated that god used one of Adam’s ribs to create Eve, which I presume people think leaves Adam short of one. This is is clearly not correct.
However…..apparently about 1 in 200-500 people have an additional cervical rib, and there is a female predominance (more likely to occur in women than men).
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