menstruation question, egg or only lining Is

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menstruation question, egg or only lining

Is menstruation only to discard of the built up uterine lining or is it also to discard the unfirtilized egg? Some sources say its to discard of the egg but this book i'm reading says its strictly only to discard of the uterine lining.
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menstruation question, egg or only lining Is menstruation…

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