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Script: Ukusukela eemvekeni ezi-19 ukusikinyeka kwe-fetus,ukuphefumula kwayo, nokubetha kwehliziyo kuthoma ukulandela ihlelo elithileko elibizwa nge-circadian rhythms. | ||
All ages referenced to fertilization, not last menstrual period. One month = 4 weeks. |